diff --git a/app/api/logic/CartLogic.php b/app/api/logic/CartLogic.php
index b033056e..af598bfa 100755
--- a/app/api/logic/CartLogic.php
+++ b/app/api/logic/CartLogic.php
@@ -155,7 +155,7 @@ class CartLogic extends Logic
 
         return [
             'lists' => array_values($lists),
-            'total_amount' => round($total, 2),
+            'total_amount' => round(0.88*$total, 2),
             'total_num' => $goods_num,
         ];
     }