diff --git a/cmd/XDC/main.go b/cmd/XDC/main.go
index 912f412739..eb6119fbfe 100644
--- a/cmd/XDC/main.go
+++ b/cmd/XDC/main.go
@@ -346,7 +346,8 @@ func startNode(ctx *cli.Context, stack *node.Node, cfg XDCConfig) {
 			for range core.CheckpointCh {
 				log.Info("Checkpoint!!! It's time to reconcile node's state...")
 				log.Info("Update consensus parameters")
-				engine.UpdateParams()
+				chain := ethereum.BlockChain()
+				engine.UpdateParams(chain.CurrentHeader())
 				if common.IsTestnet {
 					ok, err = ethereum.ValidateMasternodeTestnet()
 					if err != nil {
diff --git a/consensus/XDPoS/XDPoS.go b/consensus/XDPoS/XDPoS.go
index f6b7b5d615..869d0199d6 100644
--- a/consensus/XDPoS/XDPoS.go
+++ b/consensus/XDPoS/XDPoS.go
@@ -37,8 +37,8 @@ import (
 )
 
 const (
-	ExtraFieldCheck     = false
-	SkipExtraFieldCheck = true
+	ExtraFieldCheck     = true
+	SkipExtraFieldCheck = false
 )
 
 func (x *XDPoS) SigHash(header *types.Header) (hash common.Hash) {
@@ -79,7 +79,7 @@ func (x *XDPoS) SubscribeForensicsEvent(ch chan<- types.ForensicsEvent) event.Su
 // New creates a XDPoS delegated-proof-of-stake consensus engine with the initial
 // signers set to the ones provided by the user.
 func New(config *params.XDPoSConfig, db ethdb.Database) *XDPoS {
-	log.Info("[New] initial conensus engines")
+	log.Info("[New] initialise consensus engines")
 	// Set any missing consensus parameters to their defaults
 	if config.Epoch == 0 {
 		config.Epoch = utils.EpochLength
@@ -88,9 +88,9 @@ func New(config *params.XDPoSConfig, db ethdb.Database) *XDPoS {
 	// For testing and testing project, default to mainnet config
 	if config.V2 == nil {
 		config.V2 = &params.V2{
-			FirstSwitchBlock: params.MainnetV2Configs[0].SwitchBlock,
-			CurrentConfig:    params.MainnetV2Configs[0],
-			AllConfigs:       params.MainnetV2Configs,
+			SwitchBlock:   params.XDCMainnetChainConfig.XDPoS.V2.SwitchBlock,
+			CurrentConfig: params.MainnetV2Configs[0],
+			AllConfigs:    params.MainnetV2Configs,
 		}
 	}
 
@@ -145,8 +145,14 @@ func NewFaker(db ethdb.Database, chainConfig *params.ChainConfig) *XDPoS {
 }
 
 // Reset parameters after checkpoint due to config may change
-func (x *XDPoS) UpdateParams() {
-	x.EngineV2.UpdateParams()
+func (x *XDPoS) UpdateParams(header *types.Header) {
+	switch x.config.BlockConsensusVersion(header.Number, header.Extra, ExtraFieldCheck) {
+	case params.ConsensusEngineVersion2:
+		x.EngineV2.UpdateParams(header)
+		return
+	default: // Default "v1"
+		return
+	}
 }
 
 func (x *XDPoS) Initial(chain consensus.ChainReader, header *types.Header) error {
diff --git a/consensus/XDPoS/engines/engine_v2/engine.go b/consensus/XDPoS/engines/engine_v2/engine.go
index d8bc577f52..ab37fd820f 100644
--- a/consensus/XDPoS/engines/engine_v2/engine.go
+++ b/consensus/XDPoS/engines/engine_v2/engine.go
@@ -116,7 +116,7 @@ func New(config *params.XDPoSConfig, db ethdb.Database, waitPeriodCh chan int) *
 	timeoutTimer.OnTimeoutFn = engine.OnCountdownTimeout
 
 	engine.periodicJob()
-	config.BuildConfigIndex()
+	config.V2.BuildConfigIndex()
 
 	return engine
 }
@@ -131,7 +131,13 @@ signing. It is the hash of the entire header apart from the 65 byte signature
 contained at the end of the extra data.
 */
 
-func (x *XDPoS_v2) UpdateParams() {
+func (x *XDPoS_v2) UpdateParams(header *types.Header) {
+	_, round, _, err := x.getExtraFields(header)
+	if err != nil {
+		log.Error("[UpdateParams] retrieve round failed", "block", header.Number.Uint64(), "err", err)
+	}
+	x.config.V2.UpdateConfig(uint64(round))
+
 	// Setup timeoutTimer
 	duration := time.Duration(x.config.V2.CurrentConfig.TimeoutPeriod) * time.Second
 	x.timeoutWorker.SetTimeoutDuration(duration)
@@ -163,7 +169,7 @@ func (x *XDPoS_v2) initial(chain consensus.ChainReader, header *types.Header) er
 	var quorumCert *types.QuorumCert
 	var err error
 
-	if header.Number.Int64() == x.config.V2.FirstSwitchBlock.Int64() {
+	if header.Number.Int64() == x.config.V2.SwitchBlock.Int64() {
 		log.Info("[initial] highest QC for consensus v2 first block")
 		blockInfo := &types.BlockInfo{
 			Hash:   header.Hash(),
@@ -193,13 +199,13 @@ func (x *XDPoS_v2) initial(chain consensus.ChainReader, header *types.Header) er
 	}
 
 	// Initial first v2 snapshot
-	lastGapNum := x.config.V2.FirstSwitchBlock.Uint64() - x.config.Gap
+	lastGapNum := x.config.V2.SwitchBlock.Uint64() - x.config.Gap
 	lastGapHeader := chain.GetHeaderByNumber(lastGapNum)
 
 	snap, _ := loadSnapshot(x.db, lastGapHeader.Hash())
 
 	if snap == nil {
-		checkpointHeader := chain.GetHeaderByNumber(x.config.V2.FirstSwitchBlock.Uint64())
+		checkpointHeader := chain.GetHeaderByNumber(x.config.V2.SwitchBlock.Uint64())
 
 		log.Info("[initial] init first snapshot")
 		_, _, masternodes, err := x.getExtraFields(checkpointHeader)
@@ -246,7 +252,9 @@ func (x *XDPoS_v2) YourTurn(chain consensus.ChainReader, parent *types.Header, s
 	}
 
 	waitedTime := time.Now().Unix() - parent.Time.Int64()
-	if waitedTime < int64(x.config.V2.CurrentConfig.MinePeriod) {
+	_, parentRound, _, err := x.getExtraFields(parent)
+	minePeriod := x.config.V2.Config(uint64(parentRound) + 1).MinePeriod // plus 1 means current block
+	if waitedTime < int64(minePeriod) {
 		log.Trace("[YourTurn] wait after mine period", "minePeriod", x.config.V2.CurrentConfig.MinePeriod, "waitedTime", waitedTime)
 		return false, nil
 	}
@@ -718,7 +726,7 @@ func (x *XDPoS_v2) VerifyBlockInfo(blockChainReader consensus.ChainReader, block
 	}
 
 	// Switch block is a v1 block, there is no valid extra to decode, nor its round
-	if blockInfo.Number.Cmp(x.config.V2.FirstSwitchBlock) == 0 {
+	if blockInfo.Number.Cmp(x.config.V2.SwitchBlock) == 0 {
 		if blockInfo.Round != 0 {
 			log.Error("[VerifyBlockInfo] Switch block round is not 0", "BlockInfoHash", blockInfo.Hash.Hex(), "BlockInfoNum", blockInfo.Number, "BlockInfoRound", blockInfo.Round, "blockHeaderNum", blockHeader.Number)
 			return fmt.Errorf("[VerifyBlockInfo] switch block round have to be 0")
@@ -751,6 +759,12 @@ func (x *XDPoS_v2) verifyQC(blockChainReader consensus.ChainReader, quorumCert *
 		4. Verify gapNumber = epochSwitchNumber - epochSwitchNumber%Epoch - Gap
 		5. Verify blockInfo
 	*/
+
+	if quorumCert == nil {
+		log.Warn("[verifyQC] QC is Nil")
+		return utils.ErrInvalidQC
+	}
+
 	epochInfo, err := x.getEpochSwitchInfo(blockChainReader, parentHeader, quorumCert.ProposedBlockInfo.Hash)
 	if err != nil {
 		log.Error("[verifyQC] Error when getting epoch switch Info to verify QC", "Error", err)
@@ -763,13 +777,13 @@ func (x *XDPoS_v2) verifyQC(blockChainReader consensus.ChainReader, quorumCert *
 			log.Warn("[verifyQC] duplicated signature in QC", "duplicate", common.Bytes2Hex(d))
 		}
 	}
-	if quorumCert == nil {
-		log.Warn("[verifyQC] QC is Nil")
-		return utils.ErrInvalidQC
-	} else if (quorumCert.ProposedBlockInfo.Number.Uint64() > x.config.V2.FirstSwitchBlock.Uint64()) && (signatures == nil || (len(signatures) < x.config.V2.CurrentConfig.CertThreshold)) {
+
+	qcRound := quorumCert.ProposedBlockInfo.Round
+	certThreshold := x.config.V2.Config(uint64(qcRound)).CertThreshold
+	if (qcRound > 0) && (signatures == nil || (len(signatures) < certThreshold)) {
 		//First V2 Block QC, QC Signatures is initial nil
-		log.Warn("[verifyHeader] Invalid QC Signature is nil or empty", "QC", quorumCert, "QCNumber", quorumCert.ProposedBlockInfo.Number, "Signatures len", len(signatures))
-		return utils.ErrInvalidQC
+		log.Warn("[verifyHeader] Invalid QC Signature is nil or less then config", "QC", quorumCert, "QCNumber", quorumCert.ProposedBlockInfo.Number, "Signatures len", len(signatures), "CertThreshold", certThreshold)
+		return utils.ErrInvalidQCSignatures
 	}
 	start := time.Now()
 
@@ -798,7 +812,7 @@ func (x *XDPoS_v2) verifyQC(blockChainReader consensus.ChainReader, quorumCert *
 	}
 	wg.Wait()
 	elapsed := time.Since(start)
-	log.Info("[verifyQC] time verify message signatures of qc", "elapsed", elapsed)
+	log.Debug("[verifyQC] time verify message signatures of qc", "elapsed", elapsed)
 	if haveError != nil {
 		return haveError
 	}
@@ -826,7 +840,7 @@ func (x *XDPoS_v2) processQC(blockChainReader consensus.ChainReader, incomingQuo
 		log.Error("[processQC] Block not found using the QC", "quorumCert.ProposedBlockInfo.Hash", incomingQuorumCert.ProposedBlockInfo.Hash, "incomingQuorumCert.ProposedBlockInfo.Number", incomingQuorumCert.ProposedBlockInfo.Number)
 		return fmt.Errorf("block not found, number: %v, hash: %v", incomingQuorumCert.ProposedBlockInfo.Number, incomingQuorumCert.ProposedBlockInfo.Hash)
 	}
-	if proposedBlockHeader.Number.Cmp(x.config.V2.FirstSwitchBlock) > 0 {
+	if proposedBlockHeader.Number.Cmp(x.config.V2.SwitchBlock) > 0 {
 		// Extra field contain parent information
 		proposedBlockQuorumCert, round, _, err := x.getExtraFields(proposedBlockHeader)
 		if err != nil {
@@ -882,7 +896,7 @@ func (x *XDPoS_v2) getSyncInfo() *types.SyncInfo {
 //Find parent and grandparent, check round number, if so, commit grandparent(grandGrandParent of currentBlock)
 func (x *XDPoS_v2) commitBlocks(blockChainReader consensus.ChainReader, proposedBlockHeader *types.Header, proposedBlockRound *types.Round, incomingQc *types.QuorumCert) (bool, error) {
 	// XDPoS v1.0 switch to v2.0, skip commit
-	if big.NewInt(0).Sub(proposedBlockHeader.Number, big.NewInt(2)).Cmp(x.config.V2.FirstSwitchBlock) <= 0 {
+	if big.NewInt(0).Sub(proposedBlockHeader.Number, big.NewInt(2)).Cmp(x.config.V2.SwitchBlock) <= 0 {
 		return false, nil
 	}
 	// Find the last two parent block and check their rounds are the continuous
@@ -959,7 +973,7 @@ func (x *XDPoS_v2) calcMasternodes(chain consensus.ChainReader, blockNum *big.In
 	}
 	candidates := snap.NextEpochMasterNodes
 
-	if blockNum.Uint64() == x.config.V2.FirstSwitchBlock.Uint64()+1 {
+	if blockNum.Uint64() == x.config.V2.SwitchBlock.Uint64()+1 {
 		log.Info("[calcMasternodes] examing first v2 block")
 		return candidates, []common.Address{}, nil
 	}
diff --git a/consensus/XDPoS/engines/engine_v2/epochSwitch.go b/consensus/XDPoS/engines/engine_v2/epochSwitch.go
index e94dddd0a2..66feda0617 100644
--- a/consensus/XDPoS/engines/engine_v2/epochSwitch.go
+++ b/consensus/XDPoS/engines/engine_v2/epochSwitch.go
@@ -82,9 +82,9 @@ func (x *XDPoS_v2) getEpochSwitchInfo(chain consensus.ChainReader, header *types
 
 // IsEpochSwitchAtRound() is used by miner to check whether it mines a block in the same epoch with parent
 func (x *XDPoS_v2) isEpochSwitchAtRound(round types.Round, parentHeader *types.Header) (bool, uint64, error) {
-	epochNum := x.config.V2.FirstSwitchBlock.Uint64()/x.config.Epoch + uint64(round)/x.config.Epoch
+	epochNum := x.config.V2.SwitchBlock.Uint64()/x.config.Epoch + uint64(round)/x.config.Epoch
 	// if parent is last v1 block and this is first v2 block, this is treated as epoch switch
-	if parentHeader.Number.Cmp(x.config.V2.FirstSwitchBlock) == 0 {
+	if parentHeader.Number.Cmp(x.config.V2.SwitchBlock) == 0 {
 		return true, epochNum, nil
 	}
 
@@ -111,13 +111,13 @@ func (x *XDPoS_v2) GetCurrentEpochSwitchBlock(chain consensus.ChainReader, block
 	}
 
 	currentCheckpointNumber := epochSwitchInfo.EpochSwitchBlockInfo.Number.Uint64()
-	epochNum := x.config.V2.FirstSwitchBlock.Uint64()/x.config.Epoch + uint64(epochSwitchInfo.EpochSwitchBlockInfo.Round)/x.config.Epoch
+	epochNum := x.config.V2.SwitchBlock.Uint64()/x.config.Epoch + uint64(epochSwitchInfo.EpochSwitchBlockInfo.Round)/x.config.Epoch
 	return currentCheckpointNumber, epochNum, nil
 }
 
 func (x *XDPoS_v2) IsEpochSwitch(header *types.Header) (bool, uint64, error) {
 	// Return true directly if we are examing the last v1 block. This could happen if the calling function is examing parent block
-	if header.Number.Cmp(x.config.V2.FirstSwitchBlock) == 0 {
+	if header.Number.Cmp(x.config.V2.SwitchBlock) == 0 {
 		log.Info("[IsEpochSwitch] examing last v1 block")
 		return true, header.Number.Uint64() / x.config.Epoch, nil
 	}
@@ -129,9 +129,9 @@ func (x *XDPoS_v2) IsEpochSwitch(header *types.Header) (bool, uint64, error) {
 	}
 	parentRound := quorumCert.ProposedBlockInfo.Round
 	epochStartRound := round - round%types.Round(x.config.Epoch)
-	epochNum := x.config.V2.FirstSwitchBlock.Uint64()/x.config.Epoch + uint64(round)/x.config.Epoch
+	epochNum := x.config.V2.SwitchBlock.Uint64()/x.config.Epoch + uint64(round)/x.config.Epoch
 	// if parent is last v1 block and this is first v2 block, this is treated as epoch switch
-	if quorumCert.ProposedBlockInfo.Number.Cmp(x.config.V2.FirstSwitchBlock) == 0 {
+	if quorumCert.ProposedBlockInfo.Number.Cmp(x.config.V2.SwitchBlock) == 0 {
 		log.Info("[IsEpochSwitch] true, parent equals V2.SwitchBlock", "round", round, "number", header.Number.Uint64(), "hash", header.Hash())
 		return true, epochNum, nil
 	}
diff --git a/consensus/XDPoS/engines/engine_v2/timeout.go b/consensus/XDPoS/engines/engine_v2/timeout.go
index 63214c0893..75a74de32c 100644
--- a/consensus/XDPoS/engines/engine_v2/timeout.go
+++ b/consensus/XDPoS/engines/engine_v2/timeout.go
@@ -28,15 +28,14 @@ func (x *XDPoS_v2) timeoutHandler(blockChainReader consensus.ChainReader, timeou
 	log.Debug("[timeoutHandler] collect timeout", "number", numberOfTimeoutsInPool)
 
 	// Threshold reached
-	isThresholdReached := numberOfTimeoutsInPool >= x.config.V2.CurrentConfig.CertThreshold
+	certThreshold := x.config.V2.Config(uint64(x.currentRound)).CertThreshold
+	isThresholdReached := numberOfTimeoutsInPool >= certThreshold
 	if isThresholdReached {
 		log.Info(fmt.Sprintf("Timeout pool threashold reached: %v, number of items in the pool: %v", isThresholdReached, numberOfTimeoutsInPool))
 		err := x.onTimeoutPoolThresholdReached(blockChainReader, pooledTimeouts, timeout, timeout.GapNumber)
 		if err != nil {
 			return err
 		}
-		// clean up timeout message, regardless its GapNumber or round
-		x.timeoutPool.Clear()
 	}
 	return nil
 }
@@ -82,6 +81,11 @@ func (x *XDPoS_v2) verifyTC(chain consensus.ChainReader, timeoutCert *types.Time
 					- Use the above public key to find out the xdc address
 					- Use the above xdc address to check against the master node list from step 1(For the received TC epoch)
 	*/
+	if timeoutCert == nil || timeoutCert.Signatures == nil {
+		log.Warn("[verifyTC] TC or TC signatures is Nil")
+		return utils.ErrInvalidTC
+	}
+
 	snap, err := x.getSnapshot(chain, timeoutCert.GapNumber, true)
 	if err != nil {
 		log.Error("[verifyTC] Fail to get snapshot when verifying TC!", "TCGapNumber", timeoutCert.GapNumber)
@@ -92,16 +96,21 @@ func (x *XDPoS_v2) verifyTC(chain consensus.ChainReader, timeoutCert *types.Time
 		return fmt.Errorf("Empty master node lists from snapshot")
 	}
 
-	if timeoutCert == nil {
-		log.Warn("[verifyTC] TC is Nil")
-		return utils.ErrInvalidTC
-	} else if timeoutCert.Signatures == nil || (len(timeoutCert.Signatures) < x.config.V2.CurrentConfig.CertThreshold) {
-		log.Warn("[verifyTC] Invalid TC Signature is nil or empty", "timeoutCert.Round", timeoutCert.Round, "timeoutCert.GapNumber", timeoutCert.GapNumber, "Signatures len", len(timeoutCert.Signatures))
-		return utils.ErrInvalidTC
+	signatures, duplicates := UniqueSignatures(timeoutCert.Signatures)
+	if len(duplicates) != 0 {
+		for _, d := range duplicates {
+			log.Warn("[verifyQC] duplicated signature in QC", "duplicate", common.Bytes2Hex(d))
+		}
+	}
+
+	certThreshold := x.config.V2.Config(uint64(timeoutCert.Round)).CertThreshold
+	if len(signatures) < certThreshold {
+		log.Warn("[verifyTC] Invalid TC Signature is nil or empty", "timeoutCert.Round", timeoutCert.Round, "timeoutCert.GapNumber", timeoutCert.GapNumber, "Signatures len", len(timeoutCert.Signatures), "CertThreshold", certThreshold)
+		return utils.ErrInvalidTCSignatures
 	}
 
 	var wg sync.WaitGroup
-	wg.Add(len(timeoutCert.Signatures))
+	wg.Add(len(signatures))
 	var haveError error
 
 	signedTimeoutObj := types.TimeoutSigHash(&types.TimeoutForSign{
@@ -109,17 +118,17 @@ func (x *XDPoS_v2) verifyTC(chain consensus.ChainReader, timeoutCert *types.Time
 		GapNumber: timeoutCert.GapNumber,
 	})
 
-	for _, signature := range timeoutCert.Signatures {
+	for _, signature := range signatures {
 		go func(sig types.Signature) {
 			defer wg.Done()
 			verified, _, err := x.verifyMsgSignature(signedTimeoutObj, sig, snap.NextEpochMasterNodes)
 			if err != nil {
-				log.Error("[verifyTC] Error while verfying TC message signatures", "timeoutCert.Round", timeoutCert.Round, "timeoutCert.GapNumber", timeoutCert.GapNumber, "Signatures len", len(timeoutCert.Signatures), "Error", err)
+				log.Error("[verifyTC] Error while verfying TC message signatures", "timeoutCert.Round", timeoutCert.Round, "timeoutCert.GapNumber", timeoutCert.GapNumber, "Signatures len", len(signatures), "Error", err)
 				haveError = fmt.Errorf("Error while verfying TC message signatures")
 				return
 			}
 			if !verified {
-				log.Warn("[verifyTC] Signature not verified doing TC verification", "timeoutCert.Round", timeoutCert.Round, "timeoutCert.GapNumber", timeoutCert.GapNumber, "Signatures len", len(timeoutCert.Signatures))
+				log.Warn("[verifyTC] Signature not verified doing TC verification", "timeoutCert.Round", timeoutCert.Round, "timeoutCert.GapNumber", timeoutCert.GapNumber, "Signatures len", len(signatures))
 				haveError = fmt.Errorf("Fail to verify TC due to signature mis-match")
 				return
 			}
diff --git a/consensus/XDPoS/engines/engine_v2/utils.go b/consensus/XDPoS/engines/engine_v2/utils.go
index 90bdd1a71c..59115729ab 100644
--- a/consensus/XDPoS/engines/engine_v2/utils.go
+++ b/consensus/XDPoS/engines/engine_v2/utils.go
@@ -127,7 +127,7 @@ func (x *XDPoS_v2) getExtraFields(header *types.Header) (*types.QuorumCert, type
 	var masternodes []common.Address
 
 	// last v1 block
-	if header.Number.Cmp(x.config.V2.FirstSwitchBlock) == 0 {
+	if header.Number.Cmp(x.config.V2.SwitchBlock) == 0 {
 		masternodes = decodeMasternodesFromHeaderExtra(header)
 		return nil, types.Round(0), masternodes, nil
 	}
diff --git a/consensus/XDPoS/engines/engine_v2/verifyHeader.go b/consensus/XDPoS/engines/engine_v2/verifyHeader.go
index d72bbb013b..6ea6cc1ae3 100644
--- a/consensus/XDPoS/engines/engine_v2/verifyHeader.go
+++ b/consensus/XDPoS/engines/engine_v2/verifyHeader.go
@@ -58,7 +58,7 @@ func (x *XDPoS_v2) verifyHeader(chain consensus.ChainReader, header *types.Heade
 	if parent == nil || parent.Number.Uint64() != number-1 || parent.Hash() != header.ParentHash {
 		return consensus.ErrUnknownAncestor
 	}
-	if parent.Number.Uint64() > x.config.V2.FirstSwitchBlock.Uint64() && parent.Time.Uint64()+uint64(x.config.V2.CurrentConfig.MinePeriod) > header.Time.Uint64() {
+	if parent.Number.Uint64() > x.config.V2.SwitchBlock.Uint64() && parent.Time.Uint64()+uint64(x.config.V2.CurrentConfig.MinePeriod) > header.Time.Uint64() {
 		return utils.ErrInvalidTimestamp
 	}
 
diff --git a/consensus/XDPoS/engines/engine_v2/vote.go b/consensus/XDPoS/engines/engine_v2/vote.go
index 98ae838ed6..4a367a3761 100644
--- a/consensus/XDPoS/engines/engine_v2/vote.go
+++ b/consensus/XDPoS/engines/engine_v2/vote.go
@@ -75,7 +75,8 @@ func (x *XDPoS_v2) voteHandler(chain consensus.ChainReader, voteMsg *types.Vote)
 	go x.ForensicsProcessor.DetectEquivocationInVotePool(voteMsg, x.votePool)
 	go x.ForensicsProcessor.ProcessVoteEquivocation(chain, x, voteMsg)
 
-	thresholdReached := numberOfVotesInPool >= x.config.V2.CurrentConfig.CertThreshold
+	certThreshold := x.config.V2.Config(uint64(voteMsg.ProposedBlockInfo.Round)).CertThreshold
+	thresholdReached := numberOfVotesInPool >= certThreshold
 	if thresholdReached {
 		log.Info(fmt.Sprintf("[voteHandler] Vote pool threashold reached: %v, number of items in the pool: %v", thresholdReached, numberOfVotesInPool))
 
@@ -113,46 +114,48 @@ func (x *XDPoS_v2) onVotePoolThresholdReached(chain consensus.ChainReader, poole
 	// Filter out non-Master nodes signatures
 	var wg sync.WaitGroup
 	wg.Add(len(pooledVotes))
-	signatureSlice := make([]types.Signature, len(pooledVotes))
+	signatures := make([]types.Signature, len(pooledVotes))
 	counter := 0
 	for h, vote := range pooledVotes {
 		go func(hash common.Hash, v *types.Vote, i int) {
 			defer wg.Done()
-			verified, _, err := x.verifyMsgSignature(types.VoteSigHash(&types.VoteForSign{
+			signedVote := types.VoteSigHash(&types.VoteForSign{
 				ProposedBlockInfo: v.ProposedBlockInfo,
 				GapNumber:         v.GapNumber,
-			}), v.Signature, masternodes)
+			})
+			verified, _, err := x.verifyMsgSignature(signedVote, v.Signature, masternodes)
 			if err != nil {
-				log.Warn("[onVotePoolThresholdReached] Skip not verified vote signatures when building QC", "Error", err.Error())
+				log.Warn("[onVotePoolThresholdReached] Skip not verified vote signatures when building QC", "error", err.Error())
 			} else if !verified {
 				log.Warn("[onVotePoolThresholdReached] Skip not verified vote signatures when building QC", "verified", verified)
 			} else {
-				signatureSlice[i] = v.Signature
+				signatures[i] = v.Signature
 			}
 		}(h, vote.(*types.Vote), counter)
 		counter++
 	}
 	wg.Wait()
 	elapsed := time.Since(start)
-	log.Info("[onVotePoolThresholdReached] verify message signatures of vote pool took", "elapsed", elapsed)
+	log.Debug("[onVotePoolThresholdReached] verify message signatures of vote pool took", "elapsed", elapsed)
 
 	// The signature list may contain empty entey. we only care the ones with values
-	var validSignatureSlice []types.Signature
-	for _, v := range signatureSlice {
+	var validSignatures []types.Signature
+	for _, v := range signatures {
 		if len(v) != 0 {
-			validSignatureSlice = append(validSignatureSlice, v)
+			validSignatures = append(validSignatures, v)
 		}
 	}
 
 	// Skip and wait for the next vote to process again if valid votes is less than what we required
-	if len(validSignatureSlice) < x.config.V2.CurrentConfig.CertThreshold {
-		log.Warn("[onVotePoolThresholdReached] Not enough valid signatures to generate QC", "VotesSignaturesAfterFilter", validSignatureSlice, "NumberOfValidVotes", len(validSignatureSlice), "NumberOfVotes", len(pooledVotes))
+	certThreshold := x.config.V2.Config(uint64(currentVoteMsg.(*types.Vote).ProposedBlockInfo.Round)).CertThreshold
+	if len(validSignatures) < certThreshold {
+		log.Warn("[onVotePoolThresholdReached] Not enough valid signatures to generate QC", "VotesSignaturesAfterFilter", validSignatures, "NumberOfValidVotes", len(validSignatures), "NumberOfVotes", len(pooledVotes))
 		return nil
 	}
 	// Genrate QC
 	quorumCert := &types.QuorumCert{
 		ProposedBlockInfo: currentVoteMsg.(*types.Vote).ProposedBlockInfo,
-		Signatures:        validSignatureSlice,
+		Signatures:        validSignatures,
 		GapNumber:         currentVoteMsg.(*types.Vote).GapNumber,
 	}
 	err := x.processQC(chain, quorumCert)
diff --git a/consensus/XDPoS/utils/errors.go b/consensus/XDPoS/utils/errors.go
index 3a096e03eb..3db4cc8c8b 100644
--- a/consensus/XDPoS/utils/errors.go
+++ b/consensus/XDPoS/utils/errors.go
@@ -87,7 +87,9 @@ var (
 
 	ErrInvalidV2Extra                = errors.New("Invalid v2 extra in the block")
 	ErrInvalidQC                     = errors.New("Invalid QC content")
+	ErrInvalidQCSignatures           = errors.New("Invalid QC Signatures")
 	ErrInvalidTC                     = errors.New("Invalid TC content")
+	ErrInvalidTCSignatures           = errors.New("Invalid TC Signatures")
 	ErrEmptyBlockInfoHash            = errors.New("BlockInfo hash is empty")
 	ErrInvalidFieldInNonEpochSwitch  = errors.New("Invalid field exist in a non-epoch swtich block")
 	ErrValidatorNotWithinMasternodes = errors.New("Validaotor address is not in the master node list")
diff --git a/consensus/tests/engine_v1_tests/helper.go b/consensus/tests/engine_v1_tests/helper.go
index 3d66302650..3b777e487b 100644
--- a/consensus/tests/engine_v1_tests/helper.go
+++ b/consensus/tests/engine_v1_tests/helper.go
@@ -302,7 +302,7 @@ func CreateBlock(blockchain *BlockChain, chainConfig *params.ChainConfig, starti
 	}
 
 	// Inject the hardcoded master node list for the last v1 epoch block and all v1 epoch switch blocks (excluding genesis)
-	if big.NewInt(int64(blockNumber)).Cmp(chainConfig.XDPoS.V2.FirstSwitchBlock) == 0 || blockNumber%int(chainConfig.XDPoS.Epoch) == 0 {
+	if big.NewInt(int64(blockNumber)).Cmp(chainConfig.XDPoS.V2.SwitchBlock) == 0 || blockNumber%int(chainConfig.XDPoS.Epoch) == 0 {
 		// reset extra
 		header.Extra = []byte{}
 		if len(header.Extra) < utils.ExtraVanity {
diff --git a/consensus/tests/engine_v2_tests/adaptor_test.go b/consensus/tests/engine_v2_tests/adaptor_test.go
index 36fae6922a..6eb2ff65e1 100644
--- a/consensus/tests/engine_v2_tests/adaptor_test.go
+++ b/consensus/tests/engine_v2_tests/adaptor_test.go
@@ -66,7 +66,7 @@ func TestAdaptorGetMasternodesFromCheckpointHeader(t *testing.T) {
 	headerV1.Extra = common.Hex2Bytes("d7830100018358444388676f312e31352e38856c696e757800000000000000000278c350152e15fa6ffc712a5a73d704ce73e2e103d9e17ae3ff2c6712e44e25b09ac5ee91f6c9ff065551f0dcac6f00cae11192d462db709be3758ccef312ee5eea8d7bad5374c6a652150515d744508b61c1a4deb4e4e7bf057e4e3824c11fd2569bcb77a52905cda63b5a58507910bed335e4c9d87ae0ecdfafd400")
 	masternodesV1 := adaptor.GetMasternodesFromCheckpointHeader(headerV1)
 	headerV2 := currentBlock.Header()
-	headerV2.Number.Add(blockchain.Config().XDPoS.V2.FirstSwitchBlock, big.NewInt(1))
+	headerV2.Number.Add(blockchain.Config().XDPoS.V2.SwitchBlock, big.NewInt(1))
 	headerV2.Validators = common.Hex2Bytes("0278c350152e15fa6ffc712a5a73d704ce73e2e103d9e17ae3ff2c6712e44e25b09ac5ee91f6c9ff065551f0dcac6f00cae11192d462db709be3758c")
 	headerV2.Extra = []byte{2}
 	masternodesV2 := adaptor.GetMasternodesFromCheckpointHeader(headerV2)
@@ -91,12 +91,12 @@ func TestAdaptorIsEpochSwitch(t *testing.T) {
 	parentBlockInfo := &types.BlockInfo{
 		Hash:   header.ParentHash,
 		Round:  types.Round(0),
-		Number: big.NewInt(0).Set(blockchain.Config().XDPoS.V2.FirstSwitchBlock),
+		Number: big.NewInt(0).Set(blockchain.Config().XDPoS.V2.SwitchBlock),
 	}
 	quorumCert := &types.QuorumCert{
 		ProposedBlockInfo: parentBlockInfo,
 		Signatures:        nil,
-		GapNumber:         blockchain.Config().XDPoS.V2.FirstSwitchBlock.Uint64() - blockchain.Config().XDPoS.Gap,
+		GapNumber:         blockchain.Config().XDPoS.V2.SwitchBlock.Uint64() - blockchain.Config().XDPoS.Gap,
 	}
 	extra := types.ExtraFields_v2{
 		Round:      1,
@@ -105,19 +105,19 @@ func TestAdaptorIsEpochSwitch(t *testing.T) {
 	extraBytes, err := extra.EncodeToBytes()
 	assert.Nil(t, err)
 	header.Extra = extraBytes
-	header.Number.Add(blockchain.Config().XDPoS.V2.FirstSwitchBlock, big.NewInt(1))
+	header.Number.Add(blockchain.Config().XDPoS.V2.SwitchBlock, big.NewInt(1))
 	isEpochSwitchBlock, _, err = adaptor.IsEpochSwitch(header)
 	assert.Nil(t, err)
 	assert.True(t, isEpochSwitchBlock, "header should be epoch switch", header)
 	parentBlockInfo = &types.BlockInfo{
 		Hash:   header.ParentHash,
 		Round:  types.Round(1),
-		Number: big.NewInt(0).Add(blockchain.Config().XDPoS.V2.FirstSwitchBlock, big.NewInt(1)),
+		Number: big.NewInt(0).Add(blockchain.Config().XDPoS.V2.SwitchBlock, big.NewInt(1)),
 	}
 	quorumCert = &types.QuorumCert{
 		ProposedBlockInfo: parentBlockInfo,
 		Signatures:        nil,
-		GapNumber:         blockchain.Config().XDPoS.V2.FirstSwitchBlock.Uint64() - blockchain.Config().XDPoS.Gap,
+		GapNumber:         blockchain.Config().XDPoS.V2.SwitchBlock.Uint64() - blockchain.Config().XDPoS.Gap,
 	}
 	extra = types.ExtraFields_v2{
 		Round:      2,
@@ -126,19 +126,19 @@ func TestAdaptorIsEpochSwitch(t *testing.T) {
 	extraBytes, err = extra.EncodeToBytes()
 	assert.Nil(t, err)
 	header.Extra = extraBytes
-	header.Number.Add(blockchain.Config().XDPoS.V2.FirstSwitchBlock, big.NewInt(2))
+	header.Number.Add(blockchain.Config().XDPoS.V2.SwitchBlock, big.NewInt(2))
 	isEpochSwitchBlock, _, err = adaptor.IsEpochSwitch(header)
 	assert.Nil(t, err)
 	assert.False(t, isEpochSwitchBlock, "header should not be epoch switch", header)
 	parentBlockInfo = &types.BlockInfo{
 		Hash:   header.ParentHash,
 		Round:  types.Round(blockchain.Config().XDPoS.Epoch) - 1,
-		Number: big.NewInt(0).Add(blockchain.Config().XDPoS.V2.FirstSwitchBlock, big.NewInt(100)),
+		Number: big.NewInt(0).Add(blockchain.Config().XDPoS.V2.SwitchBlock, big.NewInt(100)),
 	}
 	quorumCert = &types.QuorumCert{
 		ProposedBlockInfo: parentBlockInfo,
 		Signatures:        nil,
-		GapNumber:         blockchain.Config().XDPoS.V2.FirstSwitchBlock.Uint64() - blockchain.Config().XDPoS.Gap,
+		GapNumber:         blockchain.Config().XDPoS.V2.SwitchBlock.Uint64() - blockchain.Config().XDPoS.Gap,
 	}
 	extra = types.ExtraFields_v2{
 		Round:      types.Round(blockchain.Config().XDPoS.Epoch) + 1,
@@ -147,19 +147,19 @@ func TestAdaptorIsEpochSwitch(t *testing.T) {
 	extraBytes, err = extra.EncodeToBytes()
 	assert.Nil(t, err)
 	header.Extra = extraBytes
-	header.Number.Add(blockchain.Config().XDPoS.V2.FirstSwitchBlock, big.NewInt(101))
+	header.Number.Add(blockchain.Config().XDPoS.V2.SwitchBlock, big.NewInt(101))
 	isEpochSwitchBlock, _, err = adaptor.IsEpochSwitch(header)
 	assert.Nil(t, err)
 	assert.True(t, isEpochSwitchBlock, "header should be epoch switch", header)
 	parentBlockInfo = &types.BlockInfo{
 		Hash:   header.ParentHash,
 		Round:  types.Round(blockchain.Config().XDPoS.Epoch) + 1,
-		Number: big.NewInt(0).Add(blockchain.Config().XDPoS.V2.FirstSwitchBlock, big.NewInt(100)),
+		Number: big.NewInt(0).Add(blockchain.Config().XDPoS.V2.SwitchBlock, big.NewInt(100)),
 	}
 	quorumCert = &types.QuorumCert{
 		ProposedBlockInfo: parentBlockInfo,
 		Signatures:        nil,
-		GapNumber:         blockchain.Config().XDPoS.V2.FirstSwitchBlock.Uint64() - blockchain.Config().XDPoS.Gap,
+		GapNumber:         blockchain.Config().XDPoS.V2.SwitchBlock.Uint64() - blockchain.Config().XDPoS.Gap,
 	}
 	extra = types.ExtraFields_v2{
 		Round:      types.Round(blockchain.Config().XDPoS.Epoch) + 2,
@@ -168,7 +168,7 @@ func TestAdaptorIsEpochSwitch(t *testing.T) {
 	extraBytes, err = extra.EncodeToBytes()
 	assert.Nil(t, err)
 	header.Extra = extraBytes
-	header.Number.Add(blockchain.Config().XDPoS.V2.FirstSwitchBlock, big.NewInt(101))
+	header.Number.Add(blockchain.Config().XDPoS.V2.SwitchBlock, big.NewInt(101))
 	isEpochSwitchBlock, _, err = adaptor.IsEpochSwitch(header)
 	assert.Nil(t, err)
 	assert.False(t, isEpochSwitchBlock, "header should not be epoch switch", header)
diff --git a/consensus/tests/engine_v2_tests/authorised_masternode_test.go b/consensus/tests/engine_v2_tests/authorised_masternode_test.go
index 98d2f63a20..316adb0f15 100644
--- a/consensus/tests/engine_v2_tests/authorised_masternode_test.go
+++ b/consensus/tests/engine_v2_tests/authorised_masternode_test.go
@@ -83,13 +83,13 @@ func TestIsYourTurnConsensusV2(t *testing.T) {
 
 func TestIsYourTurnConsensusV2CrossConfig(t *testing.T) {
 	// we skip test for v1 since it's hard to make a real genesis block
-	blockchain, _, currentBlock, signer, signFn, _ := PrepareXDCTestBlockChainForV2Engine(t, 910, params.TestXDPoSMockChainConfig, nil)
+	blockchain, _, currentBlock, signer, signFn, _ := PrepareXDCTestBlockChainForV2Engine(t, 909, params.TestXDPoSMockChainConfig, nil)
 	firstMinePeriod := blockchain.Config().XDPoS.V2.CurrentConfig.MinePeriod
 
 	adaptor := blockchain.Engine().(*XDPoS.XDPoS)
-	blockNum := 911 // 911 is new config switch block
+	blockNum := 910 // 910 is new config switch block
 	blockCoinBase := "0x111000000000000000000000000000000123"
-	currentBlock = CreateBlock(blockchain, params.TestXDPoSMockChainConfig, currentBlock, blockNum, 1, blockCoinBase, signer, signFn, nil, nil)
+	currentBlock = CreateBlock(blockchain, params.TestXDPoSMockChainConfig, currentBlock, blockNum, 10, blockCoinBase, signer, signFn, nil, nil)
 	currentBlockHeader := currentBlock.Header()
 	currentBlockHeader.Time = big.NewInt(time.Now().Unix())
 	err := blockchain.InsertBlock(currentBlock)
@@ -100,8 +100,11 @@ func TestIsYourTurnConsensusV2CrossConfig(t *testing.T) {
 	assert.Nil(t, err)
 	assert.False(t, isYourTurn)
 
+	adaptor.UpdateParams(currentBlockHeader) // it will be triggered automatically on the real code by other process
+
 	// after new mine period
 	secondMinePeriod := blockchain.Config().XDPoS.V2.CurrentConfig.MinePeriod
+
 	time.Sleep(time.Duration(secondMinePeriod-firstMinePeriod) * time.Second)
 	isYourTurn, err = adaptor.YourTurn(blockchain, currentBlockHeader, common.HexToAddress("xdc0D3ab14BBaD3D99F4203bd7a11aCB94882050E7e"))
 	assert.Nil(t, err)
diff --git a/consensus/tests/engine_v2_tests/helper.go b/consensus/tests/engine_v2_tests/helper.go
index 4b267864bc..648de3a373 100644
--- a/consensus/tests/engine_v2_tests/helper.go
+++ b/consensus/tests/engine_v2_tests/helper.go
@@ -312,10 +312,10 @@ func PrepareXDCTestBlockChainForV2Engine(t *testing.T, numOfBlocks int, chainCon
 	for i := 1; i <= numOfBlocks; i++ {
 		blockCoinBase := fmt.Sprintf("0x111000000000000000000000000000000%03d", i)
 		// for v2 blocks, fill in correct coinbase
-		if int64(i) > chainConfig.XDPoS.V2.FirstSwitchBlock.Int64() {
+		if int64(i) > chainConfig.XDPoS.V2.SwitchBlock.Int64() {
 			blockCoinBase = signer.Hex()
 		}
-		roundNumber := int64(i) - chainConfig.XDPoS.V2.FirstSwitchBlock.Int64()
+		roundNumber := int64(i) - chainConfig.XDPoS.V2.SwitchBlock.Int64()
 		block := CreateBlock(blockchain, chainConfig, currentBlock, i, roundNumber, blockCoinBase, signer, signFn, nil, nil)
 
 		err = blockchain.InsertBlock(block)
@@ -348,7 +348,7 @@ func PrepareXDCTestBlockChainForV2Engine(t *testing.T, numOfBlocks int, chainCon
 		}
 
 		// First v2 block
-		if (int64(i) - chainConfig.XDPoS.V2.FirstSwitchBlock.Int64()) == 1 {
+		if (int64(i) - chainConfig.XDPoS.V2.SwitchBlock.Int64()) == 1 {
 			lastv1BlockNumber := block.Header().Number.Uint64() - 1
 			checkpointBlockNumber := lastv1BlockNumber - lastv1BlockNumber%chainConfig.XDPoS.Epoch
 			checkpointHeader := blockchain.GetHeaderByNumber(checkpointBlockNumber)
@@ -398,10 +398,10 @@ func PrepareXDCTestBlockChainWithPenaltyForV2Engine(t *testing.T, numOfBlocks in
 	for i := 1; i <= numOfBlocks; i++ {
 		blockCoinBase := fmt.Sprintf("0x111000000000000000000000000000000%03d", i)
 		// for v2 blocks, fill in correct coinbase
-		if int64(i) > chainConfig.XDPoS.V2.FirstSwitchBlock.Int64() {
+		if int64(i) > chainConfig.XDPoS.V2.SwitchBlock.Int64() {
 			blockCoinBase = signer.Hex()
 		}
-		roundNumber := int64(i) - chainConfig.XDPoS.V2.FirstSwitchBlock.Int64()
+		roundNumber := int64(i) - chainConfig.XDPoS.V2.SwitchBlock.Int64()
 		// use signer itself as penalty
 		block := CreateBlock(blockchain, chainConfig, currentBlock, i, roundNumber, blockCoinBase, signer, signFn, signer[:], nil)
 
@@ -426,7 +426,7 @@ func CreateBlock(blockchain *BlockChain, chainConfig *params.ChainConfig, starti
 	merkleRoot := "35999dded35e8db12de7e6c1471eb9670c162eec616ecebbaf4fddd4676fb930"
 	var header *types.Header
 
-	if big.NewInt(int64(blockNumber)).Cmp(chainConfig.XDPoS.V2.FirstSwitchBlock) == 1 { // Build engine v2 compatible extra data field
+	if big.NewInt(int64(blockNumber)).Cmp(chainConfig.XDPoS.V2.SwitchBlock) == 1 { // Build engine v2 compatible extra data field
 		extraInBytes := generateV2Extra(roundNumber, currentBlock, signer, signFn, signersKey)
 
 		header = &types.Header{
@@ -436,9 +436,9 @@ func CreateBlock(blockchain *BlockChain, chainConfig *params.ChainConfig, starti
 			Coinbase:   common.HexToAddress(blockCoinBase),
 			Extra:      extraInBytes,
 		}
-		if int64(blockNumber) == (chainConfig.XDPoS.V2.FirstSwitchBlock.Int64() + 1) { // This is the first v2 block, we need to copy the last v1 epoch master node list and inject into v2 validators
+		if int64(blockNumber) == (chainConfig.XDPoS.V2.SwitchBlock.Int64() + 1) { // This is the first v2 block, we need to copy the last v1 epoch master node list and inject into v2 validators
 			// Get last master node list from last v1 block
-			lastv1Block := blockchain.GetBlockByNumber(chainConfig.XDPoS.V2.FirstSwitchBlock.Uint64())
+			lastv1Block := blockchain.GetBlockByNumber(chainConfig.XDPoS.V2.SwitchBlock.Uint64())
 			masternodesFromV1LastEpoch := decodeMasternodesFromHeaderExtra(lastv1Block.Header())
 			for _, v := range masternodesFromV1LastEpoch {
 				header.Validators = append(header.Validators, v[:]...)
@@ -446,7 +446,7 @@ func CreateBlock(blockchain *BlockChain, chainConfig *params.ChainConfig, starti
 		} else if roundNumber%int64(chainConfig.XDPoS.Epoch) == 0 {
 			// epoch switch blocks, copy the master node list and inject into v2 validators
 			// Get last master node list from last v1 block
-			lastv1Block := blockchain.GetBlockByNumber(chainConfig.XDPoS.V2.FirstSwitchBlock.Uint64())
+			lastv1Block := blockchain.GetBlockByNumber(chainConfig.XDPoS.V2.SwitchBlock.Uint64())
 			masternodesFromV1LastEpoch := decodeMasternodesFromHeaderExtra(lastv1Block.Header())
 			for _, v := range masternodesFromV1LastEpoch {
 				header.Validators = append(header.Validators, v[:]...)
@@ -465,7 +465,7 @@ func CreateBlock(blockchain *BlockChain, chainConfig *params.ChainConfig, starti
 		}
 
 		// Inject the hardcoded master node list for the last v1 epoch block and all v1 epoch switch blocks (excluding genesis)
-		if big.NewInt(int64(blockNumber)).Cmp(chainConfig.XDPoS.V2.FirstSwitchBlock) == 0 || blockNumber%int(chainConfig.XDPoS.Epoch) == 0 {
+		if big.NewInt(int64(blockNumber)).Cmp(chainConfig.XDPoS.V2.SwitchBlock) == 0 || blockNumber%int(chainConfig.XDPoS.Epoch) == 0 {
 			// reset extra
 			header.Extra = []byte{}
 			if len(header.Extra) < utils.ExtraVanity {
@@ -584,7 +584,7 @@ func findSignerAndSignFn(bc *BlockChain, header *types.Header, signer common.Add
 	addressedSignFn := signFn
 
 	// If v2 block, we need to use extra data's round to find who is creating the block in order to verify the validator
-	if header.Number.Cmp(config.XDPoS.V2.FirstSwitchBlock) > 0 {
+	if header.Number.Cmp(config.XDPoS.V2.SwitchBlock) > 0 {
 		var decodedExtraField types.ExtraFields_v2
 		err := utils.DecodeBytesExtraFields(header.Extra, &decodedExtraField)
 		if err != nil {
diff --git a/consensus/tests/engine_v2_tests/initial_test.go b/consensus/tests/engine_v2_tests/initial_test.go
index a26b7f59aa..09446171d4 100644
--- a/consensus/tests/engine_v2_tests/initial_test.go
+++ b/consensus/tests/engine_v2_tests/initial_test.go
@@ -11,7 +11,7 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-func TestInitialFirstV2Blcok(t *testing.T) {
+func TestInitialFirstV2Block(t *testing.T) {
 	blockchain, _, currentBlock, _, _, _ := PrepareXDCTestBlockChainForV2Engine(t, 900, params.TestXDPoSMockChainConfig, nil)
 	adaptor := blockchain.Engine().(*XDPoS.XDPoS)
 	header := currentBlock.Header()
@@ -32,7 +32,7 @@ func TestInitialFirstV2Blcok(t *testing.T) {
 	expectedQuorumCert := &types.QuorumCert{
 		ProposedBlockInfo: blockInfo,
 		Signatures:        nil,
-		GapNumber:         blockchain.Config().XDPoS.V2.FirstSwitchBlock.Uint64() - blockchain.Config().XDPoS.Gap,
+		GapNumber:         blockchain.Config().XDPoS.V2.SwitchBlock.Uint64() - blockchain.Config().XDPoS.Gap,
 	}
 	assert.Equal(t, types.Round(1), round)
 	assert.Equal(t, expectedQuorumCert, highQC)
@@ -104,7 +104,7 @@ func TestInitialOtherV2Block(t *testing.T) {
 	expectedQuorumCert := &types.QuorumCert{
 		ProposedBlockInfo: blockInfo,
 		Signatures:        []types.Signature{},
-		GapNumber:         blockchain.Config().XDPoS.V2.FirstSwitchBlock.Uint64() - blockchain.Config().XDPoS.Gap,
+		GapNumber:         blockchain.Config().XDPoS.V2.SwitchBlock.Uint64() - blockchain.Config().XDPoS.Gap,
 	}
 	assert.Equal(t, types.Round(11), round)
 	assert.Equal(t, expectedQuorumCert, highQC)
diff --git a/consensus/tests/engine_v2_tests/reward_test.go b/consensus/tests/engine_v2_tests/reward_test.go
index 5b44560f9f..55dc4104ca 100644
--- a/consensus/tests/engine_v2_tests/reward_test.go
+++ b/consensus/tests/engine_v2_tests/reward_test.go
@@ -23,7 +23,7 @@ func TestHookRewardV2(t *testing.T) {
 	err = json.Unmarshal([]byte(configString), &config)
 	assert.Nil(t, err)
 	// set switch to 1800, so that it covers 901-1799, 1800-2700 two epochs
-	config.XDPoS.V2.FirstSwitchBlock.SetUint64(1800)
+	config.XDPoS.V2.SwitchBlock.SetUint64(1800)
 
 	blockchain, _, _, signer, signFn, _ := PrepareXDCTestBlockChainForV2Engine(t, int(config.XDPoS.Epoch)*5, &config, nil)
 
@@ -104,7 +104,7 @@ func TestHookRewardV2SplitReward(t *testing.T) {
 	err = json.Unmarshal([]byte(configString), &config)
 	assert.Nil(t, err)
 	// set switch to 1800, so that it covers 901-1799, 1800-2700 two epochs
-	config.XDPoS.V2.FirstSwitchBlock.SetUint64(1800)
+	config.XDPoS.V2.SwitchBlock.SetUint64(1800)
 
 	blockchain, _, _, signer, signFn, _ := PrepareXDCTestBlockChainForV2Engine(t, int(config.XDPoS.Epoch)*3, &config, nil)
 
diff --git a/consensus/tests/engine_v2_tests/timeout_test.go b/consensus/tests/engine_v2_tests/timeout_test.go
index 943fd6fbbf..870fb73c57 100644
--- a/consensus/tests/engine_v2_tests/timeout_test.go
+++ b/consensus/tests/engine_v2_tests/timeout_test.go
@@ -115,7 +115,7 @@ func TestTimeoutPeriodAndThreadholdConfigChange(t *testing.T) {
 	err := blockchain.InsertBlock(currentBlock)
 	assert.Nil(t, err)
 
-	engineV2.UpdateParams() // it will be triggered automatically on the real code by other process
+	engineV2.UpdateParams(currentBlockHeader) // it will be triggered automatically on the real code by other process
 
 	t.Log("waiting for another consecutive period")
 	// another consecutive period
diff --git a/consensus/tests/engine_v2_tests/verify_header_test.go b/consensus/tests/engine_v2_tests/verify_header_test.go
index ff0b95c68d..503f56c54f 100644
--- a/consensus/tests/engine_v2_tests/verify_header_test.go
+++ b/consensus/tests/engine_v2_tests/verify_header_test.go
@@ -183,7 +183,7 @@ func TestConfigSwitchOnDifferentCertThreshold(t *testing.T) {
 
 	adaptor := blockchain.Engine().(*XDPoS.XDPoS)
 
-	// Genrate QC
+	// Genrate 911 QC
 	proposedBlockInfo := &types.BlockInfo{
 		Hash:   blockchain.GetBlockByNumber(911).Hash(),
 		Round:  types.Round(11),
@@ -198,11 +198,11 @@ func TestConfigSwitchOnDifferentCertThreshold(t *testing.T) {
 	acc1SignedHash := SignHashByPK(acc1Key, types.VoteSigHash(voteForSign).Bytes())
 	acc2SignedHash := SignHashByPK(acc2Key, types.VoteSigHash(voteForSign).Bytes())
 	acc3SignedHash := SignHashByPK(acc3Key, types.VoteSigHash(voteForSign).Bytes())
-	var signatures []types.Signature
-	signatures = append(signatures, acc1SignedHash, acc2SignedHash, acc3SignedHash)
+	var signaturesFirst []types.Signature
+	signaturesFirst = append(signaturesFirst, acc1SignedHash, acc2SignedHash, acc3SignedHash)
 	quorumCert := &types.QuorumCert{
 		ProposedBlockInfo: proposedBlockInfo,
-		Signatures:        signatures,
+		Signatures:        signaturesFirst,
 		GapNumber:         450,
 	}
 
@@ -210,18 +210,53 @@ func TestConfigSwitchOnDifferentCertThreshold(t *testing.T) {
 		Round:      types.Round(12),
 		QuorumCert: quorumCert,
 	}
-	extraInBytes, err := extra.EncodeToBytes()
-	if err != nil {
-		panic(fmt.Errorf("Error encode extra into bytes: %v", err))
-	}
+	extraInBytes, _ := extra.EncodeToBytes()
 
 	// after 910 require 5 signs, but we only give 3 signs
 	block912 := blockchain.GetBlockByNumber(912).Header()
 	block912.Extra = extraInBytes
 	err = adaptor.VerifyHeader(blockchain, block912, true)
 
-	// Error happens after verify QC, means verify QC passed
-	assert.Equal(t, utils.ErrInvalidQC, err)
+	assert.Equal(t, utils.ErrInvalidQCSignatures, err)
+
+	// Make we verification process use the corresponding config
+	// Genrate 910 QC
+	proposedBlockInfo = &types.BlockInfo{
+		Hash:   blockchain.GetBlockByNumber(910).Hash(),
+		Round:  types.Round(10),
+		Number: blockchain.GetBlockByNumber(910).Number(),
+	}
+	voteForSign = &types.VoteForSign{
+		ProposedBlockInfo: proposedBlockInfo,
+		GapNumber:         450,
+	}
+
+	// Sign from acc 1, 2, 3
+	acc1SignedHash = SignHashByPK(acc1Key, types.VoteSigHash(voteForSign).Bytes())
+	acc2SignedHash = SignHashByPK(acc2Key, types.VoteSigHash(voteForSign).Bytes())
+	acc3SignedHash = SignHashByPK(acc3Key, types.VoteSigHash(voteForSign).Bytes())
+
+	var signaturesThr []types.Signature
+	signaturesThr = append(signaturesThr, acc1SignedHash, acc2SignedHash, acc3SignedHash)
+	quorumCert = &types.QuorumCert{
+		ProposedBlockInfo: proposedBlockInfo,
+		Signatures:        signaturesThr,
+		GapNumber:         450,
+	}
+
+	extra = types.ExtraFields_v2{
+		Round:      types.Round(11),
+		QuorumCert: quorumCert,
+	}
+	extraInBytes, _ = extra.EncodeToBytes()
+
+	// QC contains 910, so it requires 3 signatures, not use block number to determine which config to use
+	block911 := blockchain.GetBlockByNumber(911).Header()
+	block911.Extra = extraInBytes
+	err = adaptor.VerifyHeader(blockchain, block911, true)
+
+	// error ErrValidatorNotWithinMasternodes means verifyQC is passed and move to next verification process
+	assert.Equal(t, utils.ErrValidatorNotWithinMasternodes, err)
 }
 
 func TestShouldFailIfNotEnoughQCSignatures(t *testing.T) {
@@ -271,7 +306,7 @@ func TestShouldFailIfNotEnoughQCSignatures(t *testing.T) {
 	headerWithDuplicatedSignatures.Extra = extraInBytes
 	// Happy path
 	err = adaptor.VerifyHeader(blockchain, headerWithDuplicatedSignatures, true)
-	assert.Equal(t, utils.ErrInvalidQC, err)
+	assert.Equal(t, utils.ErrInvalidQCSignatures, err)
 
 }
 
@@ -332,12 +367,12 @@ func TestShouldVerifyHeadersEvenIfParentsNotYetWrittenIntoDB(t *testing.T) {
 
 	// Create block 911 but don't write into DB
 	blockNumber := 911
-	roundNumber := int64(blockNumber) - config.XDPoS.V2.FirstSwitchBlock.Int64()
+	roundNumber := int64(blockNumber) - config.XDPoS.V2.SwitchBlock.Int64()
 	block911 := CreateBlock(blockchain, &config, block910, blockNumber, roundNumber, signer.Hex(), signer, signFn, nil, nil)
 
 	// Create block 912 and not write into DB as well
 	blockNumber = 912
-	roundNumber = int64(blockNumber) - config.XDPoS.V2.FirstSwitchBlock.Int64()
+	roundNumber = int64(blockNumber) - config.XDPoS.V2.SwitchBlock.Int64()
 	block912 := CreateBlock(blockchain, &config, block911, blockNumber, roundNumber, signer.Hex(), signer, signFn, nil, nil)
 
 	headersTobeVerified = append(headersTobeVerified, block910.Header(), block911.Header(), block912.Header())
diff --git a/core/blockchain.go b/core/blockchain.go
index 127abcb199..9b23f71333 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -2541,7 +2541,7 @@ func (bc *BlockChain) UpdateM1() error {
 		header := bc.CurrentHeader()
 		var maxMasternodes int
 		// check if block number is increase ms checkpoint
-		if bc.chainConfig.IsTIPIncreaseMasternodes(header.Number) || (bc.chainConfig.XDPoS.V2.FirstSwitchBlock != nil && header.Number.Cmp(bc.chainConfig.XDPoS.V2.FirstSwitchBlock) == 1) {
+		if bc.chainConfig.IsTIPIncreaseMasternodes(header.Number) || (bc.chainConfig.XDPoS.V2.SwitchBlock != nil && header.Number.Cmp(bc.chainConfig.XDPoS.V2.SwitchBlock) == 1) {
 			// using new masterndoes
 			maxMasternodes = common.MaxMasternodesV2
 		} else {
diff --git a/core/genesis.go b/core/genesis.go
index 214f5a335c..79a73f34db 100644
--- a/core/genesis.go
+++ b/core/genesis.go
@@ -321,7 +321,6 @@ func GenesisBlockForTesting(db ethdb.Database, addr common.Address, balance *big
 // DefaultGenesisBlock returns the Ethereum main net genesis block.
 func DefaultGenesisBlock() *Genesis {
 	config := params.XDCMainnetChainConfig
-	config.XDPoS.V2 = nil
 	return &Genesis{
 		Config:     config,
 		Nonce:      0,
diff --git a/eth/hooks/engine_v2_hooks.go b/eth/hooks/engine_v2_hooks.go
index c9ec604635..e1f44305ad 100644
--- a/eth/hooks/engine_v2_hooks.go
+++ b/eth/hooks/engine_v2_hooks.go
@@ -86,7 +86,7 @@ func AttachConsensusV2Hooks(adaptor *XDPoS.XDPoS, bc *core.BlockChain, chainConf
 
 		// get list check penalties signing block & list master nodes wil comeback
 		// start to calc comeback at v2 block + limitPenaltyEpochV2 to avoid reading v1 blocks
-		comebackHeight := (common.LimitPenaltyEpochV2+1)*chain.Config().XDPoS.Epoch + chain.Config().XDPoS.V2.FirstSwitchBlock.Uint64()
+		comebackHeight := (common.LimitPenaltyEpochV2+1)*chain.Config().XDPoS.Epoch + chain.Config().XDPoS.V2.SwitchBlock.Uint64()
 		penComebacks := []common.Address{}
 		if number.Uint64() > comebackHeight {
 			pens := adaptor.EngineV2.GetPreviousPenaltyByHash(chain, currentHash, common.LimitPenaltyEpochV2)
@@ -170,7 +170,7 @@ func AttachConsensusV2Hooks(adaptor *XDPoS.XDPoS, bc *core.BlockChain, chainConf
 		}
 		rewards := make(map[string]interface{})
 		// skip hook reward if this is the first v2
-		if number == chain.Config().XDPoS.V2.FirstSwitchBlock.Uint64()+1 {
+		if number == chain.Config().XDPoS.V2.SwitchBlock.Uint64()+1 {
 			return rewards, nil
 		}
 		start := time.Now()
@@ -235,7 +235,7 @@ func GetSigningTxCount(c *XDPoS.XDPoS, chain consensus.ChainReader, header *type
 		if err != nil {
 			return nil, err
 		}
-		if isEpochSwitch && i != chain.Config().XDPoS.V2.FirstSwitchBlock.Uint64()+1 {
+		if isEpochSwitch && i != chain.Config().XDPoS.V2.SwitchBlock.Uint64()+1 {
 			epochCount += 1
 			if epochCount == signEpochCount {
 				endBlockNumber = header.Number.Uint64() - 1
diff --git a/miner/worker.go b/miner/worker.go
index 86ea4f125c..2acbc6a869 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -291,7 +291,7 @@ func (self *worker) update() {
 		// A real event arrived, process interesting content
 		select {
 		case v := <-WaitPeriodCh:
-			log.Info("[worker] update mine period", "period", v)
+			log.Info("[worker] update wait period", "period", v)
 			waitPeriod = v
 			timeout.Reset(time.Duration(waitPeriod) * time.Second)
 
diff --git a/params/config.go b/params/config.go
index 7e7ab323b5..0540de7b0d 100644
--- a/params/config.go
+++ b/params/config.go
@@ -19,8 +19,10 @@ package params
 import (
 	"fmt"
 	"math/big"
+	"sync"
 
 	"github.com/XinFinOrg/XDPoSChain/common"
+	"github.com/XinFinOrg/XDPoSChain/log"
 )
 
 const (
@@ -39,7 +41,7 @@ var (
 var (
 	MainnetV2Configs = map[uint64]*V2Config{
 		Default: {
-			SwitchBlock:          big.NewInt(9999999999),
+			SwitchRound:          0,
 			CertThreshold:        common.MaxMasternodesV2*2/3 + 1,
 			TimeoutSyncThreshold: 3,
 			TimeoutPeriod:        60,
@@ -47,7 +49,7 @@ var (
 			MinePeriod:           10,
 		},
 		9999999999: {
-			SwitchBlock:          big.NewInt(9999999999),
+			SwitchRound:          9999999999,
 			CertThreshold:        common.MaxMasternodesV2*2/3 + 1,
 			TimeoutSyncThreshold: 3,
 			TimeoutPeriod:        60,
@@ -57,31 +59,23 @@ var (
 	}
 	TestV2Configs = map[uint64]*V2Config{
 		Default: {
-			SwitchBlock:          big.NewInt(900),
+			SwitchRound:          0,
 			CertThreshold:        3,
 			TimeoutSyncThreshold: 2,
 			TimeoutPeriod:        4,
 			WaitPeriod:           1,
 			MinePeriod:           2,
 		},
-		900: {
-			SwitchBlock:          big.NewInt(900),
-			CertThreshold:        3,
-			TimeoutSyncThreshold: 2,
-			TimeoutPeriod:        4,
-			WaitPeriod:           1,
-			MinePeriod:           2,
-		},
-		910: {
-			SwitchBlock:          big.NewInt(910),
+		10: {
+			SwitchRound:          10,
 			CertThreshold:        5,
 			TimeoutSyncThreshold: 2,
 			TimeoutPeriod:        4,
 			WaitPeriod:           2,
 			MinePeriod:           3,
 		},
-		1799: {
-			SwitchBlock:          big.NewInt(1799),
+		899: {
+			SwitchRound:          899,
 			CertThreshold:        5,
 			TimeoutSyncThreshold: 4,
 			TimeoutPeriod:        5,
@@ -92,31 +86,23 @@ var (
 
 	DevnetV2Configs = map[uint64]*V2Config{
 		Default: {
-			SwitchBlock:          big.NewInt(7074000),
-			CertThreshold:        4,
-			TimeoutSyncThreshold: 5,
-			TimeoutPeriod:        10,
-			WaitPeriod:           5,
-			MinePeriod:           5,
-		},
-		7074000: {
-			SwitchBlock:          big.NewInt(7074000),
+			SwitchRound:          0,
 			CertThreshold:        common.MaxMasternodesV2*2/3 + 1,
 			TimeoutSyncThreshold: 5,
 			TimeoutPeriod:        25,
 			WaitPeriod:           10,
 			MinePeriod:           10,
 		},
-		7224300: {
-			SwitchBlock:          big.NewInt(7224300),
+		151919: {
+			SwitchRound:          151919,
 			CertThreshold:        common.MaxMasternodesV2*1/2 + 1,
 			TimeoutSyncThreshold: 8,
 			TimeoutPeriod:        50,
 			WaitPeriod:           5,
 			MinePeriod:           20,
 		},
-		7242300: {
-			SwitchBlock:          big.NewInt(7242300),
+		171000: {
+			SwitchRound:          171000,
 			CertThreshold:        common.MaxMasternodesV2*2/3 + 1,
 			TimeoutSyncThreshold: 5,
 			TimeoutPeriod:        25,
@@ -142,9 +128,9 @@ var (
 			Gap:                 450,
 			FoudationWalletAddr: common.HexToAddress("xdc92a289fe95a85c53b8d0d113cbaef0c1ec98ac65"),
 			V2: &V2{
-				FirstSwitchBlock: MainnetV2Configs[0].SwitchBlock,
-				CurrentConfig:    MainnetV2Configs[0],
-				AllConfigs:       MainnetV2Configs,
+				SwitchBlock:   big.NewInt(9999999999),
+				CurrentConfig: MainnetV2Configs[0],
+				AllConfigs:    MainnetV2Configs,
 			},
 		},
 	}
@@ -184,7 +170,7 @@ var (
 			Gap:                 450,
 			FoudationWalletAddr: common.HexToAddress("xdc746249c61f5832c5eed53172776b460491bdcd5c"),
 			V2: &V2{
-				FirstSwitchBlock: TestV2Configs[0].SwitchBlock,
+				SwitchBlock:      big.NewInt(900),
 				CurrentConfig:    TestV2Configs[0],
 				AllConfigs:       TestV2Configs,
 				SkipV2Validation: true,
@@ -209,9 +195,9 @@ var (
 			Gap:                 450,
 			FoudationWalletAddr: common.HexToAddress("0x746249c61f5832c5eed53172776b460491bdcd5c"),
 			V2: &V2{
-				FirstSwitchBlock: DevnetV2Configs[0].SwitchBlock,
-				CurrentConfig:    DevnetV2Configs[0],
-				AllConfigs:       DevnetV2Configs,
+				SwitchBlock:   big.NewInt(7074000),
+				CurrentConfig: DevnetV2Configs[0],
+				AllConfigs:    DevnetV2Configs,
 			},
 		},
 	}
@@ -232,9 +218,9 @@ var (
 			Period: 15,
 			Epoch:  30000,
 			V2: &V2{
-				FirstSwitchBlock: MainnetV2Configs[0].SwitchBlock,
-				CurrentConfig:    MainnetV2Configs[0],
-				AllConfigs:       MainnetV2Configs,
+				SwitchBlock:   big.NewInt(9999999999),
+				CurrentConfig: MainnetV2Configs[0],
+				AllConfigs:    MainnetV2Configs,
 			},
 		},
 	}
@@ -275,9 +261,9 @@ var (
 			FoudationWalletAddr: common.HexToAddress("0x0000000000000000000000000000000000000068"),
 			Reward:              250,
 			V2: &V2{
-				FirstSwitchBlock: TestV2Configs[0].SwitchBlock,
-				CurrentConfig:    TestV2Configs[0],
-				AllConfigs:       TestV2Configs,
+				SwitchBlock:   big.NewInt(900),
+				CurrentConfig: TestV2Configs[0],
+				AllConfigs:    TestV2Configs,
 			},
 		},
 	}
@@ -347,27 +333,78 @@ type XDPoSConfig struct {
 }
 
 type V2 struct {
-	FirstSwitchBlock *big.Int             `json:"switchBlock"`
-	CurrentConfig    *V2Config            `json:"config"`
-	AllConfigs       map[uint64]*V2Config `json:"allConfigs"`
-	configIndex      []uint64             //list of switch block of configs
-	SkipV2Validation bool                 //Skip Block Validation for testing purpose, V2 consensus only
+	lock sync.RWMutex // Protects the signer fields
+
+	SwitchBlock   *big.Int             `json:"switchBlock"`
+	CurrentConfig *V2Config            `json:"config"`
+	AllConfigs    map[uint64]*V2Config `json:"allConfigs"`
+	configIndex   []uint64             //list of switch block of configs
+
+	SkipV2Validation bool //Skip Block Validation for testing purpose, V2 consensus only
 }
 
 type V2Config struct {
-	WaitPeriod           int      `json:"waitPeriod"`           // Miner wait period to check mine event
-	MinePeriod           int      `json:"minePeriod"`           // Miner mine period to mine a block
-	SwitchBlock          *big.Int `json:"switchBlock"`          // v1 to v2 switch block number
-	TimeoutSyncThreshold int      `json:"timeoutSyncThreshold"` // send syncInfo after number of timeout
-	TimeoutPeriod        int      `json:"timeoutPeriod"`        // Duration in ms
-	CertThreshold        int      `json:"certificateThreshold"` // Necessary number of messages from master nodes to form a certificate
+	SwitchRound          uint64 `json:"switchRound"`          // v1 to v2 switch block number
+	WaitPeriod           int    `json:"waitPeriod"`           // Miner wait period to check mine event
+	MinePeriod           int    `json:"minePeriod"`           // Miner mine period to mine a block
+	TimeoutSyncThreshold int    `json:"timeoutSyncThreshold"` // send syncInfo after number of timeout
+	TimeoutPeriod        int    `json:"timeoutPeriod"`        // Duration in ms
+	CertThreshold        int    `json:"certificateThreshold"` // Necessary number of messages from master nodes to form a certificate
 }
 
-// String implements the stringer interface, returning the consensus engine details.
-func (c *XDPoSConfig) BuildConfigIndex() {
+func (c *XDPoSConfig) String() string {
+	return "XDPoS"
+}
+
+func (c *XDPoSConfig) BlockConsensusVersion(num *big.Int, extraByte []byte, extraCheck bool) string {
+	if extraCheck && (len(extraByte) == 0 || extraByte[0] != 2) {
+		return ConsensusEngineVersion1
+	}
+
+	if c.V2 != nil && c.V2.SwitchBlock != nil && num.Cmp(c.V2.SwitchBlock) > 0 {
+		return ConsensusEngineVersion2
+	}
+	return ConsensusEngineVersion1
+}
+
+func (v *V2) UpdateConfig(round uint64) {
+	v.lock.Lock()
+	defer v.lock.Unlock()
+
+	var index uint64
+
+	//find the right config
+	for i := range v.configIndex {
+		if v.configIndex[i] <= round {
+			index = v.configIndex[i]
+		} else {
+			break
+		}
+	}
+	// update to current config
+	log.Info("[updateV2Config] Update config", "index", index, "round", round, "SwitchRound", v.AllConfigs[index].SwitchRound)
+	v.CurrentConfig = v.AllConfigs[index]
+}
+
+func (v *V2) Config(round uint64) *V2Config {
+	configRound := round - 1 //start from next block from SwitchRound number
+	var index uint64
+
+	//find the right config
+	for i := range v.configIndex {
+		if v.configIndex[i] <= configRound {
+			index = v.configIndex[i]
+		} else {
+			break
+		}
+	}
+	return v.AllConfigs[index]
+}
+
+func (v *V2) BuildConfigIndex() {
 	var list []uint64
 
-	for i := range c.V2.AllConfigs {
+	for i := range v.AllConfigs {
 		list = append(list, i)
 	}
 
@@ -379,40 +416,12 @@ func (c *XDPoSConfig) BuildConfigIndex() {
 			}
 		}
 	}
-	c.V2.configIndex = list
+	log.Info("[BuildConfigIndex] config list", "list", list)
+	v.configIndex = list
 }
 
-func (c *XDPoSConfig) String() string {
-	return "XDPoS"
-}
-
-func (c *XDPoSConfig) updateV2Config(num uint64) {
-	var index uint64
-
-	//find the right config
-	for i := range c.V2.configIndex {
-		if c.V2.configIndex[i] <= num {
-			index = c.V2.configIndex[i]
-		} else {
-			break
-		}
-	}
-	// update to current config
-	c.V2.CurrentConfig = c.V2.AllConfigs[index]
-}
-
-func (c *XDPoSConfig) BlockConsensusVersion(num *big.Int, extraByte []byte, skipExtraCheck bool) string {
-	if !skipExtraCheck && (len(extraByte) == 0 || extraByte[0] != 2) {
-		return ConsensusEngineVersion1
-	}
-
-	if c.V2 != nil && c.V2.FirstSwitchBlock != nil && num.Cmp(c.V2.FirstSwitchBlock) > 0 {
-		// We have to check each block configuration due to reorg chain case
-		// Block may get rollback and old config need to apply to verify block
-		c.updateV2Config(num.Uint64() - 1)
-		return ConsensusEngineVersion2
-	}
-	return ConsensusEngineVersion1
+func (v *V2) ConfigIndex() []uint64 {
+	return v.configIndex
 }
 
 // String implements the fmt.Stringer interface.
diff --git a/params/config_test.go b/params/config_test.go
index 02c5fe2917..9143762d23 100644
--- a/params/config_test.go
+++ b/params/config_test.go
@@ -20,6 +20,8 @@ import (
 	"math/big"
 	"reflect"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestCheckCompatible(t *testing.T) {
@@ -79,3 +81,39 @@ func TestCheckCompatible(t *testing.T) {
 		}
 	}
 }
+
+func TestUpdateV2Config(t *testing.T) {
+	TestnetChainConfig.XDPoS.V2.BuildConfigIndex()
+	c := TestnetChainConfig.XDPoS.V2.CurrentConfig
+	assert.Equal(t, 3, c.CertThreshold)
+
+	TestnetChainConfig.XDPoS.V2.UpdateConfig(10)
+	c = TestnetChainConfig.XDPoS.V2.CurrentConfig
+	assert.Equal(t, 5, c.CertThreshold)
+
+	TestnetChainConfig.XDPoS.V2.UpdateConfig(899)
+	c = TestnetChainConfig.XDPoS.V2.CurrentConfig
+	assert.Equal(t, 4, c.TimeoutSyncThreshold)
+}
+
+func TestV2Config(t *testing.T) {
+	TestnetChainConfig.XDPoS.V2.BuildConfigIndex()
+	c := TestnetChainConfig.XDPoS.V2.Config(1)
+	assert.Equal(t, 3, c.CertThreshold)
+
+	c = TestnetChainConfig.XDPoS.V2.Config(5)
+	assert.Equal(t, 3, c.CertThreshold)
+
+	c = TestnetChainConfig.XDPoS.V2.Config(10)
+	assert.Equal(t, 3, c.CertThreshold)
+
+	c = TestnetChainConfig.XDPoS.V2.Config(11)
+	assert.Equal(t, 5, c.CertThreshold)
+}
+
+func TestBuildConfigIndex(t *testing.T) {
+	TestnetChainConfig.XDPoS.V2.BuildConfigIndex()
+	index := TestnetChainConfig.XDPoS.V2.ConfigIndex()
+	expected := []uint64{0, 10, 899}
+	assert.Equal(t, expected, index)
+}