diff --git a/app/config/config.go b/app/config/config.go
index e2e48404ad..838c97bfd3 100644
--- a/app/config/config.go
+++ b/app/config/config.go
@@ -122,6 +122,8 @@ type OecConfig struct {
 
 	//
 	commitGapOffset int64
+	// enable mempool sim gu factor
+	enableMempoolSimGuFactor bool
 }
 
 const (
@@ -159,6 +161,7 @@ const (
 	FlagEnableHasBlockPartMsg      = "enable-blockpart-ack"
 	FlagDebugGcInterval            = "debug.gc-interval"
 	FlagCommitGapOffset            = "commit-gap-offset"
+	FlagEnableMempoolSimGuFactor   = "enable-mem-sim-gu-factor"
 )
 
 var (
@@ -308,6 +311,7 @@ func (c *OecConfig) loadFromConfig() {
 	c.SetEnableHasBlockPartMsg(viper.GetBool(FlagEnableHasBlockPartMsg))
 	c.SetGcInterval(viper.GetInt(FlagDebugGcInterval))
 	c.SetIavlAcNoBatch(viper.GetBool(tmiavl.FlagIavlCommitAsyncNoBatch))
+	c.SetEnableMempoolSimGuFactor(viper.GetBool(FlagEnableMempoolSimGuFactor))
 }
 
 func resolveNodeKeyWhitelist(plain string) []string {
@@ -380,6 +384,7 @@ func (c *OecConfig) format() string {
     commit-gap-height: %d
 	enable-analyzer: %v
     iavl-commit-async-no-batch: %v
+    enable-mempool-sim-gu-factor: %v
 	active-view-change: %v`, system.ChainName,
 		c.GetMempoolRecheck(),
 		c.GetMempoolForceRecheckGap(),
@@ -409,6 +414,7 @@ func (c *OecConfig) format() string {
 		c.GetCommitGapHeight(),
 		c.GetEnableAnalyzer(),
 		c.GetIavlAcNoBatch(),
+		c.GetEnableMempoolSimGuFactor(),
 		c.GetActiveVC(),
 	)
 }
@@ -658,6 +664,12 @@ func (c *OecConfig) updateFromKVStr(k, v string) {
 			return
 		}
 		c.SetCommitGapOffset(r)
+	case FlagEnableMempoolSimGuFactor:
+		r, err := strconv.ParseBool(v)
+		if err != nil {
+			return
+		}
+		c.SetEnableMempoolSimGuFactor(r)
 	}
 
 }
@@ -1075,3 +1087,11 @@ func (c *OecConfig) GetIavlAcNoBatch() bool {
 func (c *OecConfig) SetIavlAcNoBatch(value bool) {
 	c.iavlAcNoBatch = value
 }
+
+func (c *OecConfig) SetEnableMempoolSimGuFactor(v bool) {
+	c.enableMempoolSimGuFactor = v
+}
+
+func (c *OecConfig) GetEnableMempoolSimGuFactor() bool {
+	return c.enableMempoolSimGuFactor
+}
diff --git a/cmd/client/flags.go b/cmd/client/flags.go
index ad9467d5db..7c892c466d 100644
--- a/cmd/client/flags.go
+++ b/cmd/client/flags.go
@@ -69,6 +69,7 @@ func RegisterAppFlag(cmd *cobra.Command) {
 	cmd.Flags().Int(config.FlagDynamicGpCheckBlocks, 5, "The recommended number of blocks checked of dynamic gas price [1,100])")
 	cmd.Flags().Int(config.FlagDynamicGpCoefficient, 1, "Adjustment coefficient of dynamic gas price [1,100])")
 	cmd.Flags().Int(config.FlagDynamicGpMode, tmtypes.MinimalGpMode, "Dynamic gas price mode (0: higher price|1: normal price|2: minimal price) is used to manage flags")
+	cmd.Flags().Bool(config.FlagEnableMempoolSimGuFactor, true, "Enable mempool simulate gas used is after the gu_factor(false is mean the simulate gas used is no has gu_factor)")
 
 	cmd.Flags().Bool(config.FlagEnableHasBlockPartMsg, false, "Enable peer to broadcast HasBlockPartMessage")
 	cmd.Flags().Bool(eth.FlagEnableMultiCall, false, "Enable node to support the eth_multiCall RPC API")
diff --git a/libs/cosmos-sdk/baseapp/abci.go b/libs/cosmos-sdk/baseapp/abci.go
index 186b33784b..079ccdd004 100644
--- a/libs/cosmos-sdk/baseapp/abci.go
+++ b/libs/cosmos-sdk/baseapp/abci.go
@@ -480,6 +480,15 @@ func handleSimulate(app *BaseApp, path []string, height int64, txBytes []byte, o
 			return res, shouldAddBuffer, err
 		}
 	}
+
+	if isMempoolSim {
+		gInfo, res, _ := app.MempoolSimulate(txBytes, tx, height, overrideBytes, from)
+		return sdk.SimulationResponse{
+			GasInfo: gInfo,
+			Result:  res,
+		}, shouldAddBuffer, nil
+	}
+
 	gInfo, res, err := app.Simulate(txBytes, tx, height, overrideBytes, from)
 	if err != nil && !isMempoolSim {
 		return sdk.SimulationResponse{}, false, sdkerrors.Wrap(err, "failed to simulate tx")
diff --git a/libs/cosmos-sdk/baseapp/baseapp_mode_base.go b/libs/cosmos-sdk/baseapp/baseapp_mode_base.go
index ecf1d3b735..2af8d41dd7 100644
--- a/libs/cosmos-sdk/baseapp/baseapp_mode_base.go
+++ b/libs/cosmos-sdk/baseapp/baseapp_mode_base.go
@@ -100,7 +100,7 @@ type modeHandlerSimulate struct {
 	*modeHandlerBase
 }
 
-//modeHandlerTrace derived from modeHandlerDeliver
+// modeHandlerTrace derived from modeHandlerDeliver
 type modeHandlerTrace struct {
 	*modeHandlerDeliver
 }
@@ -164,15 +164,15 @@ func (m *modeHandlerBase) handleRunMsg(info *runTxInfo) (err error) {
 	return
 }
 
-//=============================
+// =============================
 // 4. handleDeferGasConsumed
 func (m *modeHandlerBase) handleDeferGasConsumed(*runTxInfo) {}
 
-//====================================================================
+// ====================================================================
 // 5. handleDeferRefund
 func (m *modeHandlerBase) handleDeferRefund(*runTxInfo) {}
 
-//===========================================================================================
+// ===========================================================================================
 // other members
 func (m *modeHandlerBase) setGasConsumed(info *runTxInfo) {
 	info.ctx.BlockGasMeter().ConsumeGas(info.ctx.GasMeter().GasConsumedToLimit(), "block gas meter")
diff --git a/libs/cosmos-sdk/baseapp/baseapp_mode_simulate.go b/libs/cosmos-sdk/baseapp/baseapp_mode_simulate.go
index 8d439f21dd..c577376812 100644
--- a/libs/cosmos-sdk/baseapp/baseapp_mode_simulate.go
+++ b/libs/cosmos-sdk/baseapp/baseapp_mode_simulate.go
@@ -21,6 +21,9 @@ func (m *modeHandlerSimulate) handleStartHeight(info *runTxInfo, height int64) e
 			fmt.Sprintf("height(%d) should be greater than start block height(%d)", height, startHeight))
 	} else if height > startHeight && height <= lastHeight {
 		info.ctx, err = app.getContextForSimTx(info.txBytes, height)
+		if m.mode == runTxModeSimulate && info.mempoolSimulate {
+			info.ctx.SetMempoolSimulate(true)
+		}
 	} else {
 		err = sdkerrors.Wrap(sdkerrors.ErrInvalidRequest,
 			fmt.Sprintf("height(%d) should be less than or equal to latest block height(%d)", height, lastHeight))
diff --git a/libs/cosmos-sdk/baseapp/baseapp_parallel.go b/libs/cosmos-sdk/baseapp/baseapp_parallel.go
index 17754d1c3f..fe92514b9e 100644
--- a/libs/cosmos-sdk/baseapp/baseapp_parallel.go
+++ b/libs/cosmos-sdk/baseapp/baseapp_parallel.go
@@ -334,8 +334,8 @@ func (app *BaseApp) endParallelTxs(txSize int) [][]byte {
 	return app.logFix(txs, logIndex, hasEnterEvmTx, errs, resp)
 }
 
-//we reuse the nonce that changed by the last async call
-//if last ante handler has been failed, we need rerun it ? or not?
+// we reuse the nonce that changed by the last async call
+// if last ante handler has been failed, we need rerun it ? or not?
 func (app *BaseApp) deliverTxWithCache(txIndex int) *executeResult {
 	app.parallelTxManage.currentRerunIndex = txIndex
 	defer func() {
diff --git a/libs/cosmos-sdk/baseapp/baseapp_runtx.go b/libs/cosmos-sdk/baseapp/baseapp_runtx.go
index 2771f8e28a..cf10b01874 100644
--- a/libs/cosmos-sdk/baseapp/baseapp_runtx.go
+++ b/libs/cosmos-sdk/baseapp/baseapp_runtx.go
@@ -34,7 +34,8 @@ type runTxInfo struct {
 	reusableCacheMultiStore sdk.CacheMultiStore
 	overridesBytes          []byte
 
-	outOfGas bool
+	outOfGas        bool
+	mempoolSimulate bool // for judge this sim is from mempool
 }
 
 func (info *runTxInfo) GetCacheMultiStore() (sdk.CacheMultiStore, bool) {
diff --git a/libs/cosmos-sdk/baseapp/helpers.go b/libs/cosmos-sdk/baseapp/helpers.go
index 9dc44f15e2..338d7e150c 100644
--- a/libs/cosmos-sdk/baseapp/helpers.go
+++ b/libs/cosmos-sdk/baseapp/helpers.go
@@ -1,6 +1,7 @@
 package baseapp
 
 import (
+	cfg "github.com/okex/exchain/libs/tendermint/config"
 	"regexp"
 
 	abci "github.com/okex/exchain/libs/tendermint/abci/types"
@@ -23,6 +24,18 @@ func (app *BaseApp) Simulate(txBytes []byte, tx sdk.Tx, height int64, overridesB
 	return info.gInfo, info.result, e
 }
 
+func (app *BaseApp) MempoolSimulate(txBytes []byte, tx sdk.Tx, height int64, overridesBytes []byte, from ...string) (sdk.GasInfo, *sdk.Result, error) {
+	info := &runTxInfo{
+		overridesBytes:  overridesBytes,
+		mempoolSimulate: true,
+	}
+	if cfg.DynamicConfig.GetEnableMempoolSimGuFactor() {
+		info.mempoolSimulate = false // the mempoolSimulate is false is need gu factor
+	}
+	e := app.runtxWithInfo(info, runTxModeSimulate, txBytes, tx, height, from...)
+	return info.gInfo, info.result, e
+}
+
 func (app *BaseApp) Deliver(tx sdk.Tx) (sdk.GasInfo, *sdk.Result, error) {
 	info, e := app.runTx(runTxModeDeliver, nil, tx, LatestSimulateTxHeight)
 	return info.gInfo, info.result, e
diff --git a/libs/cosmos-sdk/types/context.go b/libs/cosmos-sdk/types/context.go
index 0f4548de91..b069d05b76 100644
--- a/libs/cosmos-sdk/types/context.go
+++ b/libs/cosmos-sdk/types/context.go
@@ -58,6 +58,7 @@ type Context struct {
 
 	statedb  vm.StateDB
 	outOfGas bool
+  mempoolSimulate bool // if mempoolSimulate = true, then is mempool simulate tx
 }
 
 // Proposed rename, not done to avoid API breakage
@@ -563,6 +564,14 @@ func (c Context) Value(key interface{}) interface{} {
 	return c.ctx.Value(key)
 }
 
+func (c *Context) SetMempoolSimulate(v bool) {
+	c.mempoolSimulate = v
+}
+
+func (c *Context) IsMempoolSimulate() bool {
+	return c.mempoolSimulate
+}
+
 func (c *Context) SetOutOfGas(v bool) {
 	c.outOfGas = v
 }
diff --git a/libs/tendermint/config/dynamic_config_okchain.go b/libs/tendermint/config/dynamic_config_okchain.go
index c69bea78a7..34843f27a4 100644
--- a/libs/tendermint/config/dynamic_config_okchain.go
+++ b/libs/tendermint/config/dynamic_config_okchain.go
@@ -34,6 +34,7 @@ type IDynamicConfig interface {
 	GetDynamicGpMaxTxNum() int64
 	GetDynamicGpMaxGasUsed() int64
 	GetGasLimitBuffer() uint64
+	GetEnableMempoolSimGuFactor() bool
 }
 
 var DynamicConfig IDynamicConfig = MockDynamicConfig{}
@@ -190,3 +191,7 @@ func (d MockDynamicConfig) GetDynamicGpMaxGasUsed() int64 {
 func (d MockDynamicConfig) GetGasLimitBuffer() uint64 {
 	return 0
 }
+
+func (d MockDynamicConfig) GetEnableMempoolSimGuFactor() bool {
+	return false
+}
diff --git a/x/evm/types/state_transition.go b/x/evm/types/state_transition.go
index e77c164c49..f7a2b05a49 100644
--- a/x/evm/types/state_transition.go
+++ b/x/evm/types/state_transition.go
@@ -254,7 +254,7 @@ func (st StateTransition) TransitionDb(ctx sdk.Context, config ChainConfig) (exe
 		contractAddressStr := EthAddressToString(&contractAddress)
 		recipientLog = strings.Join([]string{"contract address ", contractAddressStr}, "")
 		gasConsumed = gasLimit - leftOverGas
-		if !csdb.GuFactor.IsNegative() {
+		if !ctx.IsMempoolSimulate() && !csdb.GuFactor.IsNegative() {
 			gasConsumed = csdb.GuFactor.MulInt(sdk.NewIntFromUint64(gasConsumed)).TruncateInt().Uint64()
 		}
 		//if no err, we must be check weather out of gas because, we may increase gasConsumed by 'csdb.GuFactor'.
@@ -294,7 +294,7 @@ func (st StateTransition) TransitionDb(ctx sdk.Context, config ChainConfig) (exe
 
 		recipientLog = strings.Join([]string{"recipient address ", recipientStr}, "")
 		gasConsumed = gasLimit - leftOverGas
-		if !csdb.GuFactor.IsNegative() {
+		if !ctx.IsMempoolSimulate() && !csdb.GuFactor.IsNegative() {
 			gasConsumed = csdb.GuFactor.MulInt(sdk.NewIntFromUint64(gasConsumed)).TruncateInt().Uint64()
 		}
 		//if no err, we must be check weather out of gas because, we may increase gasConsumed by 'csdb.GuFactor'.