diff --git a/doc/Shop.py b/doc/Shop.py
index bfd33f4..05974a3 100644
--- a/doc/Shop.py
+++ b/doc/Shop.py
@@ -27,8 +27,9 @@ class Shop(object):
                 'url': 'webapp/index.php?c=Shop&a=buy',
                 'params': [
                     _common.ReqHead(),
-                    ['shop_id', '', '商店id'],
-                    ['goods_id', '', '商品id'],
+                    ['shop_id', 0, '商店id'],
+                    ['goods_id', 0, '商品id'],
+                    ['cost_item_id', 0, '支付方式'],
                 ],
                 'response': [
                     _common.RspHead(),
diff --git a/doc/_common.py b/doc/_common.py
index 2cd051e..8cff6e7 100644
--- a/doc/_common.py
+++ b/doc/_common.py
@@ -104,18 +104,31 @@ class PropertyChg(object):
             ['user_info', UserInfo(), '用户信息变更(用来更新本地客户端字段（有则更新无则不变）)']
         ]
 
+class CostInfo(object):
+
+    def __init__(self):
+        self.fields = [
+            ['cost_item_id', 0, '购买需要消耗的道具id'],
+            ['cost_item_num', 0, '购买需要消耗的道具数量'],
+        ]
+
+class PriceInfo(object):
+
+    def __init__(self):
+        self.fields = [
+            ['!cost_items', [CostInfo()], '购买需要扣费道具信息(金币、钻石视为道具，可能有多种价格)'],
+            ['discount', 0, '折扣百分比（0-100）'],
+            ['discount_left_time', 0, '折扣剩余时间(单位秒)'],
+        ]
+
 class Goods(object):
 
     def __init__(self):
         self.fields = [
             ['goods_id', 0, '商品id 用于购买的时候回传'],
             ['item_id', 0, '配置表id'],
+            ['price_info', PriceInfo(), '价格信息'],
             ['flag_icon', '', '商品标记(商品左上角的显示图标,超值、9折等)'],
-            ['cost_item_id', 0, '购买需要消耗的道具id(原价)'],
-            ['cost_item_num', 0, '购买需要消耗的道具数量(原价)'],
-            ['discount_cost_item_id', 0, '购买需要消耗的道具id(实际)'],
-            ['discount_cost_item_num', 0, '购买需要消耗的道具数量（免费时为0）(实际)'],
-            ['discount_left_time', 0, '折扣剩余时间(单位秒)'],
             ['limit_type', 0, '0:不限购(这时忽略bought_times、total_buy_times) 1:每日限购 2:周限购 3:累计限购'],
             ['bought_times', 0, '已购买次数'],
             ['total_buy_times', 0, '总的可购买次数'],