diff --git a/accounts/abi/bind/backends/simulated.go b/accounts/abi/bind/backends/simulated.go
index ea79ab448423b..15d7edc7e1445 100644
--- a/accounts/abi/bind/backends/simulated.go
+++ b/accounts/abi/bind/backends/simulated.go
@@ -141,10 +141,11 @@ func NewXDCSimulatedBackend(alloc core.GenesisAlloc, gasLimit uint64, chainConfi
 
 // NewSimulatedBackend creates a new binding backend using a simulated blockchain
 // for testing purposes.
+//
 // A simulated backend always uses chainID 1337.
-func NewSimulatedBackend(alloc core.GenesisAlloc) *SimulatedBackend {
+func NewSimulatedBackend(alloc core.GenesisAlloc, gasLimit uint64) *SimulatedBackend {
 	database := rawdb.NewMemoryDatabase()
-	genesis := core.Genesis{Config: params.AllEthashProtocolChanges, Alloc: alloc, GasLimit: 42000000}
+	genesis := core.Genesis{Config: params.AllEthashProtocolChanges, GasLimit: gasLimit, Alloc: alloc}
 	genesis.MustCommit(database)
 	blockchain, _ := core.NewBlockChain(database, nil, genesis.Config, ethash.NewFaker(), vm.Config{})
 
diff --git a/contracts/randomize/randomize_test.go b/contracts/randomize/randomize_test.go
index 14d229196c6c4..fd117681f1b05 100644
--- a/contracts/randomize/randomize_test.go
+++ b/contracts/randomize/randomize_test.go
@@ -73,7 +73,7 @@ func TestRandomize(t *testing.T) {
 
 func TestSendTxRandomizeSecretAndOpening(t *testing.T) {
 	genesis := core.GenesisAlloc{acc1Addr: {Balance: big.NewInt(1000000000000)}}
-	backend := backends.NewSimulatedBackend(genesis)
+	backend := backends.NewSimulatedBackend(genesis, 42000000)
 	backend.Commit()
 	signer := types.HomesteadSigner{}
 	ctx := context.Background()
diff --git a/contracts/tests/Inherited_test.go b/contracts/tests/Inherited_test.go
index 94298fc0e3b46..a60fa6344f5b4 100644
--- a/contracts/tests/Inherited_test.go
+++ b/contracts/tests/Inherited_test.go
@@ -2,15 +2,16 @@ package tests
 
 import (
 	"fmt"
+	"math/big"
+	"os"
+	"testing"
+
 	"github.com/XinFinOrg/XDPoSChain/accounts/abi/bind"
 	"github.com/XinFinOrg/XDPoSChain/accounts/abi/bind/backends"
 	"github.com/XinFinOrg/XDPoSChain/common"
 	"github.com/XinFinOrg/XDPoSChain/core"
 	"github.com/XinFinOrg/XDPoSChain/crypto"
 	"github.com/XinFinOrg/XDPoSChain/log"
-	"math/big"
-	"os"
-	"testing"
 )
 
 var (
@@ -27,7 +28,7 @@ func TestPriceFeed(t *testing.T) {
 	// init genesis
 	contractBackend := backends.NewSimulatedBackend(core.GenesisAlloc{
 		mainAddr: {Balance: big.NewInt(0).Mul(big.NewInt(10000000000000), big.NewInt(10000000000000))},
-	})
+	}, 42000000)
 	transactOpts := bind.NewKeyedTransactor(mainKey)
 	// deploy payer swap SMC
 	addr, contract, err := DeployMyInherited(transactOpts, contractBackend)
diff --git a/contracts/trc21issuer/trc21issuer_test.go b/contracts/trc21issuer/trc21issuer_test.go
index a8658b105be3d..aeebb7b7ad723 100644
--- a/contracts/trc21issuer/trc21issuer_test.go
+++ b/contracts/trc21issuer/trc21issuer_test.go
@@ -33,7 +33,7 @@ func TestFeeTxWithTRC21Token(t *testing.T) {
 	// init genesis
 	contractBackend := backends.NewSimulatedBackend(core.GenesisAlloc{
 		mainAddr: {Balance: big.NewInt(0).Mul(big.NewInt(10000000000000), big.NewInt(10000000000000))},
-	})
+	}, 42000000)
 	transactOpts := bind.NewKeyedTransactor(mainKey)
 	// deploy payer swap SMC
 	trc21IssuerAddr, trc21Issuer, err := DeployTRC21Issuer(transactOpts, contractBackend, minApply)