diff --git a/consensus/tests/engine_v2_tests/helper.go b/consensus/tests/engine_v2_tests/helper.go
index c702704174..90e68dc7a9 100644
--- a/consensus/tests/engine_v2_tests/helper.go
+++ b/consensus/tests/engine_v2_tests/helper.go
@@ -682,9 +682,6 @@ func PrepareXDCTestBlockChainWithProtectorObserver(t *testing.T, numOfBlocks int
 		}
 		block := CreateBlock(blockchain, chainConfig, currentBlock, i, roundNumber, blockCoinBase, signer, signFn, penalty, nil, "f11ec19df702aa6bd9b3b2186edbc66d6b50b06334455a4a2ae8d166f28a14ff")
 
-		if i == 900 {
-			fmt.Println(block.Penalties())
-		}
 		err = blockchain.InsertBlock(block)
 		if err != nil {
 			t.Fatal(err)
diff --git a/consensus/tests/engine_v2_tests/reward_test.go b/consensus/tests/engine_v2_tests/reward_test.go
index 60eba07ada..9d095b3c3f 100644
--- a/consensus/tests/engine_v2_tests/reward_test.go
+++ b/consensus/tests/engine_v2_tests/reward_test.go
@@ -291,9 +291,9 @@ func TestHookRewardAfterUpgrade(t *testing.T) {
 		assert.Equal(t, addr, observer1Addr)
 		r := x.(map[common.Address]*big.Int)
 		owner := state.GetCandidateOwner(parentState, addr)
-		a, _ := big.NewInt(0).SetString("270000000000000000000", 10)
+		a, _ := big.NewInt(0).SetString("270112500000000000000", 10) // this value tests the float64 reward
 		assert.Zero(t, a.Cmp(r[owner]), "real reward is", r[owner])
-		b, _ := big.NewInt(0).SetString("30000000000000000000", 10)
+		b, _ := big.NewInt(0).SetString("30012500000000000000", 10) // this value tests the float64 reward
 		assert.Zero(t, b.Cmp(r[config.XDPoS.FoudationWalletAddr]), "real reward is", r[config.XDPoS.FoudationWalletAddr])
 	}
 	common.TIPUpgradeReward = backup
diff --git a/eth/hooks/engine_v2_hooks.go b/eth/hooks/engine_v2_hooks.go
index 3a8f578b74..4cfb228456 100644
--- a/eth/hooks/engine_v2_hooks.go
+++ b/eth/hooks/engine_v2_hooks.go
@@ -234,7 +234,7 @@ func AttachConsensusV2Hooks(adaptor *XDPoS.XDPoS, bc *core.BlockChain, chainConf
 			rewardsMap["signersProtector"] = signers[ProtectorNodeBeneficiary]
 			rewardsMap["signersObserver"] = signers[ObserverNodeBeneficiary]
 			type rewardWithType struct {
-				r   uint64
+				r   float64
 				t   Beneficiary
 				key string
 			}
@@ -243,7 +243,8 @@ func AttachConsensusV2Hooks(adaptor *XDPoS.XDPoS, bc *core.BlockChain, chainConf
 				{currentConfig.ProtectorReward, ProtectorNodeBeneficiary, "rewardsProtector"},
 				{currentConfig.ObserverReward, ObserverNodeBeneficiary, "rewardsObserver"},
 			} {
-				originalReward := new(big.Int).Mul(new(big.Int).SetUint64(rwt.r), new(big.Int).SetUint64(params.Ether))
+				originalRewardFloat := new(big.Float).Mul(new(big.Float).SetFloat64(rwt.r), new(big.Float).SetUint64(params.Ether))
+				originalReward, _ := originalRewardFloat.Int(nil)
 				chainReward := util.RewardInflation(chain, originalReward, number, common.BlocksPerYear)
 				rewardSigners, err := CalculateRewardForSignerFixed(chainReward, signers[rwt.t])
 				if err != nil {
diff --git a/params/config.go b/params/config.go
index 94aaeff9f9..0142090df4 100644
--- a/params/config.go
+++ b/params/config.go
@@ -180,7 +180,7 @@ var (
 			ExpTimeoutConfig:     ExpTimeoutConfig{Base: 1.0, MaxExponent: 0},
 			MasternodeReward:     500, // double as Reward
 			ProtectorReward:      400,
-			ObserverReward:       300,
+			ObserverReward:       300.125,
 		},
 	}
 
@@ -462,9 +462,9 @@ type V2Config struct {
 	TimeoutPeriod        int     `json:"timeoutPeriod"`        // Duration in ms
 	CertThreshold        float64 `json:"certificateThreshold"` // Necessary number of messages from master nodes to form a certificate
 
-	MasternodeReward uint64 `json:"masternodeReward"` // Block reward per master node (core validator) - unit Ether
-	ProtectorReward  uint64 `json:"protectorReward"`  // Block reward per protector - unit Ether
-	ObserverReward   uint64 `json:"observerReward"`   // Block reward per observer - unit Ether
+	MasternodeReward float64 `json:"masternodeReward"` // Block reward per master node (core validator) - unit Ether
+	ProtectorReward  float64 `json:"protectorReward"`  // Block reward per protector - unit Ether
+	ObserverReward   float64 `json:"observerReward"`   // Block reward per observer - unit Ether
 
 	ExpTimeoutConfig ExpTimeoutConfig `json:"expTimeoutConfig"`
 }