diff --git a/packageE/pages/cart/cart2/cart2.js b/packageE/pages/cart/cart2/cart2.js
index 13c09a2..4da4554 100644
--- a/packageE/pages/cart/cart2/cart2.js
+++ b/packageE/pages/cart/cart2/cart2.js
@@ -3678,8 +3678,11 @@ Page({
         else out_of_weight = -back_data.weight_free * 1000;
 
         if(out_of_weight<0){
-          if (goods_weight < 0) goods_weight = 0;
-          goods_weight+=goods_weight_out1;
+          if (goods_weight < 0 && goods_weight_out1<0) goods_weight = -1;
+          else{
+             if(goods_weight<0) goods_weight=0;
+             goods_weight+=(goods_weight_out1>-1?goods_weight_out1:0);
+          }  
         }