diff --git a/platformapi/jdapi/jdapi.go b/platformapi/jdapi/jdapi.go
index a2afb720..2c78e6c8 100644
--- a/platformapi/jdapi/jdapi.go
+++ b/platformapi/jdapi/jdapi.go
@@ -1,6 +1,7 @@
 package jdapi
 
 import (
+	"bytes"
 	"crypto/md5"
 	"encoding/json"
 	"fmt"
@@ -117,13 +118,14 @@ func (a *API) signParams(jdParams map[string]interface{}) string {
 	}
 
 	sort.Strings(keys)
-	allStr := a.appSecret
+	buf := &bytes.Buffer{}
+	buf.WriteString(a.appSecret)
 	for _, k := range keys {
-		allStr += k + fmt.Sprint(jdParams[k])
+		buf.WriteString(k)
+		buf.WriteString(fmt.Sprint(jdParams[k]))
 	}
-	allStr = allStr + a.appSecret
-
-	return fmt.Sprintf("%X", md5.Sum([]byte(allStr)))
+	buf.WriteString(a.appSecret)
+	return fmt.Sprintf("%X", md5.Sum(buf.Bytes()))
 }
 
 func New(token, appKey, appSecret string, config ...*platformapi.APIConfig) *API {
diff --git a/platformapi/jdapi/store_test.go b/platformapi/jdapi/store_test.go
index 27e6f385..47f5d5f6 100644
--- a/platformapi/jdapi/store_test.go
+++ b/platformapi/jdapi/store_test.go
@@ -63,7 +63,7 @@ func TestUpdateStoreInfo4Open(t *testing.T) {
 		Operator:       "test",
 		StationAddress: oldAddress + "T",
 	}
-	err = api.UpdateStoreInfo4Open2(params)
+	err = api.UpdateStoreInfo4Open2(params, false)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -75,7 +75,7 @@ func TestUpdateStoreInfo4Open(t *testing.T) {
 	}
 
 	params.StationAddress = oldAddress
-	api.UpdateStoreInfo4Open2(params)
+	api.UpdateStoreInfo4Open2(params, false)
 	if err != nil {
 		t.Fatal(err)
 	}