diff --git a/app/api/lists/order/CartList.php b/app/api/lists/order/CartList.php
index 43765c46b..76e9ddf34 100644
--- a/app/api/lists/order/CartList.php
+++ b/app/api/lists/order/CartList.php
@@ -74,7 +74,7 @@ class CartList extends BaseAdminDataLists implements ListsSearchInterface, Lists
 
             if ($find) {
                 if($off_activity==1){
-                    $this->activity_price = bcadd(bcmul($item['cost'],$item['cart_num'], 2), $this->activity_price, 2);
+                    $this->activity_price = bcadd(bcmul($find['cost'],$find['cart_num'], 2), $this->activity_price, 2);
                 }else{
                     if ($user && $user['user_ship'] == 1) {
                         //更新 会员为1的时候原价减去会员价