diff --git a/business/mtps/controller/order.go b/business/mtps/controller/order.go
index 042f62185..ad7eef788 100644
--- a/business/mtps/controller/order.go
+++ b/business/mtps/controller/order.go
@@ -11,7 +11,7 @@ type OrderController struct {
 func Error2Response(err error) *mtpsapi.MtpsCallbackResponse {
 	if err != nil {
 		return &mtpsapi.MtpsCallbackResponse{
-			Code: "-1",
+			Code: -1,
 		}
 	}
 	return mtpsapi.SuccessResponse