diff --git a/pages/cart/cart/cart.js b/pages/cart/cart/cart.js
index bcc71ec..47250af 100644
--- a/pages/cart/cart/cart.js
+++ b/pages/cart/cart/cart.js
@@ -607,10 +607,10 @@ Page({
 
                             //如果是阶梯购的时候
                             if(item.prom_type==10){
-                                
+
                                 var url = '/api/weshop/cart/update';
                                 getApp().request.put(url, {
-                                    data:{id:item.id,store_id:oo.stoid,prom_type:10,prom_id:act.id}
+                                    data:{id:item.id,store_id:oo.stoid,prom_type:10,prom_id:item.prom_id}
                                 });
 
                                 if(!th.data.ladder_map[item.prom_id]){