diff --git a/service/chain_service/chain_service.go b/service/chain_service/chain_service.go
index 27e0c244..507082fe 100644
--- a/service/chain_service/chain_service.go
+++ b/service/chain_service/chain_service.go
@@ -160,3 +160,10 @@ func GetAddressTokenBalance(network types.Network, address common.Address, token
 	return balanceResultFloat, nil
 
 }
+func GetChainId(chain types.Network) (*big.Int, error) {
+	client, exist := EthCompatibleNetWorkClientMap[chain]
+	if !exist {
+		return nil, xerrors.Errorf("chain Client [%s] not exist", chain)
+	}
+	return client.ChainID(context.Background())
+}
diff --git a/service/chain_service/chain_test.go b/service/chain_service/chain_test.go
index 729d1154..7c55121e 100644
--- a/service/chain_service/chain_test.go
+++ b/service/chain_service/chain_test.go
@@ -36,3 +36,9 @@ func TestGetAddressTokenBalance(t *testing.T) {
 	assert.NoError(t, err)
 	fmt.Println(res)
 }
+
+func TestGetChainId(t *testing.T) {
+	res, err := GetChainId(types.Sepolia)
+	assert.NoError(t, err)
+	fmt.Println(res)
+}
diff --git a/service/operator/try_pay_user_op_execute.go b/service/operator/try_pay_user_op_execute.go
index 1c343d1b..1b8fa678 100644
--- a/service/operator/try_pay_user_op_execute.go
+++ b/service/operator/try_pay_user_op_execute.go
@@ -11,10 +11,11 @@ import (
 	"AAStarCommunity/EthPaymaster_BackService/service/pay_service"
 	"AAStarCommunity/EthPaymaster_BackService/service/validator_service"
 	"encoding/hex"
-	"encoding/json"
 	"fmt"
 	"github.com/ethereum/go-ethereum/accounts/abi"
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/rlp"
 	"golang.org/x/xerrors"
 	"strconv"
 	"strings"
@@ -131,7 +132,7 @@ func getPayMasterSignature(strategy *model.Strategy, userOp *model.UserOperation
 	signatureBytes, _ := utils.SignUserOp("1d8a58126e87e53edc7b24d58d1328230641de8c4242c135492bf5560e0ff421", userOp)
 	return hex.EncodeToString(signatureBytes)
 }
-func packUserOp(userOp *model.UserOperation) (string, error) {
+func packUserOp(userOp *model.UserOperation) (string, []byte, error) {
 	abiEncoder, err := abi.JSON(strings.NewReader(`[
     {
         "inputs": [
@@ -205,32 +206,35 @@ func packUserOp(userOp *model.UserOperation) (string, error) {
     }
 ]`))
 	if err != nil {
-		return "", err
+		return "", nil, err
 	}
 
 	encoded, err := abiEncoder.Pack("test", userOp)
 	if err != nil {
-		return "", err
+		return "", nil, err
 	}
 	hexString := hex.EncodeToString(encoded)
-	return hexString, nil
+	return hexString, encoded, nil
 }
 
-func packUserOpSimple(userOp *model.UserOperation) (string, error) {
-	data, err := json.Marshal(userOp)
+func UserOpHash(userOp *model.UserOperation, strategy *model.Strategy, validStart string, validEnd string) ([]byte, error) {
+	_, packUserOpStrByte, err := packUserOp(userOp)
 	if err != nil {
-		return "", err
-	}
-	hexString := hex.EncodeToString(data)
-
-	return hexString, nil
+		return nil, nil
 
+	}
+	chainId, err := chain_service.GetChainId(strategy.NetWork)
+	if err != nil {
+		return nil, nil
+	}
+	input := []interface{}{packUserOpStrByte, chainId.Int64(), strategy.PayMasterAddress, userOp.Nonce, validStart, validEnd}
+	encodeRes, err := rlp.EncodeToBytes(input)
+	if err != nil {
+		return nil, nil
+	}
+	byteRes := crypto.Keccak256(encodeRes)
+	return byteRes, nil
 }
-
-//	func UserOpHash(userOp *model.UserOperation, chainId string, strategy *model.Strategy, validStart string, validEnd string) []byte {
-//		packUserOp(userOp)
-//
-// }
 func getPayMasterAndData(strategy *model.Strategy, userOp *model.UserOperation, gasResponse *model.ComputeGasResponse) (string, string, error) {
 	return generatePayMasterAndData(strategy)
 }
diff --git a/service/operator/try_pay_user_op_execute_test.go b/service/operator/try_pay_user_op_execute_test.go
index b9da05e5..cfdb7af2 100644
--- a/service/operator/try_pay_user_op_execute_test.go
+++ b/service/operator/try_pay_user_op_execute_test.go
@@ -37,20 +37,17 @@ func TestPackUserOp(t *testing.T) {
 	userOp, _ := model.NewUserOp(utils.GenerateMockUserOperation())
 	userOp.PaymasterAndData = nil
 	userOp.Signature = nil
-	res, err := packUserOp(userOp)
+	res, byteres, err := packUserOp(userOp)
 
 	assert.NoError(t, err)
 	fmt.Println(res)
-
+	fmt.Println(byteres)
 }
-func TestPackUserOpV2(t *testing.T) {
-	userOp, _ := model.NewUserOp(utils.GenerateMockUserOperation())
-	userOp.Signature = nil
-	userOp.PaymasterAndData = nil
-	res, err := packUserOpSimple(userOp)
-	assert.NoError(t, err)
-	fmt.Println(res)
+
+func TestUserOpHash(t *testing.T) {
+
 }
+
 func TestUserOP(t *testing.T) {
 	userOp, _ := model.NewUserOp(utils.GenerateMockUserOperation())
 	fmt.Println(userOp.Sender.String())