diff --git a/common/constants.go b/common/constants.go
index 9dd97f3a2c..89ba5c315f 100644
--- a/common/constants.go
+++ b/common/constants.go
@@ -12,4 +12,5 @@ const (
 	EpocBlockRandomize      = 900
 	MaxMasternodes          = 150
 	LimitPenaltyEpoch       = 4
+	BlocksPerYear           = uint64(15768000)
 )
\ No newline at end of file
diff --git a/contracts/utils.go b/contracts/utils.go
index b2d8b42cc8..42144ec96b 100644
--- a/contracts/utils.go
+++ b/contracts/utils.go
@@ -43,6 +43,7 @@ type rewardLog struct {
 }
 
 var TxSignMu sync.RWMutex
+
 // Send tx sign for block number to smart contract blockSigner.
 func CreateTransactionSign(chainConfig *params.ChainConfig, pool *core.TxPool, manager *accounts.Manager, block *types.Block, chainDb ethdb.Database) error {
 	TxSignMu.Lock()
diff --git a/eth/backend.go b/eth/backend.go
index d50fe1fe4a..2e9168ce35 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -291,7 +291,10 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 			if number > 0 && number-rCheckpoint > 0 && foudationWalletAddr != (common.Address{}) {
 				// Get signers in blockSigner smartcontract.
 				addr := common.HexToAddress(common.BlockSigners)
+				// Get reward inflation.
 				chainReward := new(big.Int).Mul(new(big.Int).SetUint64(chain.Config().XDPoS.Reward), new(big.Int).SetUint64(params.Ether))
+				chainReward = rewardInflation(chainReward, number, common.BlocksPerYear)
+				
 				totalSigner := new(uint64)
 				signers, err := contracts.GetRewardForCheckpoint(chain, addr, number, rCheckpoint, client, totalSigner)
 				if err != nil {
@@ -645,4 +648,15 @@ func GetValidators(bc *core.BlockChain, masternodes []common.Address) ([]byte, e
 		return contracts.BuildValidatorFromM2(m2), nil
 	}
 	return nil, core.ErrNotFoundM1
+}
+
+func rewardInflation(chainReward *big.Int, number uint64, blockPerYear uint64) *big.Int {
+	if blockPerYear*2 <= number && number < blockPerYear*6 {
+		chainReward.Div(chainReward, new(big.Int).SetUint64(2))
+	}
+	if blockPerYear*6 <= number {
+		chainReward.Div(chainReward, new(big.Int).SetUint64(4))
+	}
+
+	return chainReward
 }
\ No newline at end of file
diff --git a/eth/backend_test.go b/eth/backend_test.go
new file mode 100644
index 0000000000..49d5228481
--- /dev/null
+++ b/eth/backend_test.go
@@ -0,0 +1,24 @@
+package eth
+
+import (
+	"github.com/ethereum/go-ethereum/params"
+	"math/big"
+	"testing"
+)
+
+func TestRewardInflation(t *testing.T) {
+	for i := 0; i < 100; i++ {
+		chainReward := new(big.Int).Mul(new(big.Int).SetUint64(250), new(big.Int).SetUint64(params.Ether))
+		chainReward = rewardInflation(chainReward, uint64(i), 10)
+
+		halfReward := new(big.Int).Mul(new(big.Int).SetUint64(125), new(big.Int).SetUint64(params.Ether))
+		if 20 <= i && i < 60 && chainReward.Cmp(halfReward) != 0 {
+			t.Error("Fail tor calculate reward inflation for 2 -> 5 years", "chainReward", chainReward)
+		}
+
+		quarterReward := new(big.Int).Mul(new(big.Int).SetUint64(62.5*1000), new(big.Int).SetUint64(params.Finney))
+		if 60 <= i && chainReward.Cmp(quarterReward) != 0 {
+			t.Error("Fail tor calculate reward inflation above 6 years", "chainReward", chainReward)
+		}
+	}
+}
\ No newline at end of file