diff --git a/common/chain/chain.go b/common/chain/chain.go
index 457f3e3..e32033b 100644
--- a/common/chain/chain.go
+++ b/common/chain/chain.go
@@ -8,40 +8,15 @@ import (
 	"github.com/tidwall/gjson"
 )
 
-//var defaultChain = `
-//{
-//  "ETH": [
-//    200,
-//    2001
-//  ],
-//  "POLYGON": [
-//    201,
-//    2011
-//  ],
-//  "BSC": [
-//    202,
-//    2021
-//  ],
-//  "TRON": [
-//    205,
-//    2051
-//  ],
-//  "BTC": [
-//    300,
-//    3001
-//  ],
-//  "FIL": [
-//    301,
-//    3011
-//  ],
-//  "XRP": [
-//    310,
-//    3101
-//  ]
-//}
-//`
-
-var defaultChainCode = map[string]map[int64]int{"ETH": {200: 1, 2001: 1}, "POLYGON": {201: 1, 2011: 1}, "BSC": {202: 1}, "TRON": {205: 1}, "BTC": {300: 1}, "FIL": {301: 1}, "XRP": {310: 1}}
+var defaultChainCode = map[string]map[int64]int8{
+	"ETH":     {200: 1, 2001: 1},
+	"POLYGON": {201: 1, 2011: 1},
+	"BSC":     {202: 1},
+	"TRON":    {205: 1},
+	"BTC":     {300: 1},
+	"FIL":     {301: 1},
+	"XRP":     {310: 1},
+}
 
 func LoadConfig(path string) (string, error) {
 	f, err := os.OpenFile(path, os.O_RDONLY, os.ModeAppend)
@@ -58,18 +33,16 @@ func LoadConfig(path string) (string, error) {
 	return string(b), nil
 }
 
-func LoadChainCodeFile(file string) map[string]map[int64]int {
-
-	mp := make(map[string]map[int64]int)
-
+func LoadChainCodeFile(file string) map[string]map[int64]int8 {
 	//set customer config
+	mp := make(map[string]map[int64]int8)
 	if len(file) > 1 {
 		body, _ := LoadConfig(file)
 		if len(body) > 1 {
 			gjson.Parse(body).ForEach(func(key, v gjson.Result) bool {
 				k := key.String()
 				list := v.Array()
-				m := make(map[int64]int)
+				m := make(map[int64]int8)
 				for _, v := range list {
 					code := v.Int()
 					m[code] = 1
@@ -81,11 +54,6 @@ func LoadChainCodeFile(file string) map[string]map[int64]int {
 
 	}
 
-	if len(mp) < 1 {
-		// default
-		mp = defaultChainCode
-	}
-
 	return mp
 }
 
@@ -93,7 +61,11 @@ func GetChainCode(chainCode int64, chainName string, log *xlog.XLog) bool {
 	if log == nil {
 		log = xlog.NewXLogger()
 	}
-	mp := LoadChainCodeFile("./chain.json")
+	mp := defaultChainCode
+
+	//todo load chainCode if it is necessary, but it is not efficient because It loads configuration files very frequently
+	//mp = LoadChainCodeFile("./chain.json")
+
 	if mp == nil {
 		log.Errorf("unknown all chainCode，this is a fatal error")
 		return false