diff --git a/doc/_common.py b/doc/_common.py
index e4fd236..bbdc006 100644
--- a/doc/_common.py
+++ b/doc/_common.py
@@ -108,9 +108,9 @@ class CostInfoItem(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'],
-            ['cost_item_is_discount', 0, '是否参与折扣'],
+            ['item_id', 0, '购买需要消耗的道具id'],
+            ['item_num', 0, '购买需要消耗的道具数量'],
+            ['is_discount', 0, '是否参与折扣'],
         ]
 
 class CostInfo(object):
diff --git a/webapp/controller/ShopController.class.php b/webapp/controller/ShopController.class.php
index 7d0ec37..8ef0dcd 100644
--- a/webapp/controller/ShopController.class.php
+++ b/webapp/controller/ShopController.class.php
@@ -76,7 +76,7 @@ class ShopController extends BaseAuthedController {
     {
         $itemId = getReqVal('item_id', 0);
         $itemNum = getReqVal('item_num', 0);
-        $costItemId = getReqVal('cost_item_id', 0);
+        $costItemId = getReqVal('item_id', 0);
 
         $itemMeta = mt\Item::get($itemId);
         if (!$itemMeta) {
@@ -89,14 +89,14 @@ class ShopController extends BaseAuthedController {
         }
         $costItemMeta = mt\Item::get($costItemId);
         if (!$costItemMeta) {
-            $this->_rspErr(1, 'cost_item_id参数错误');
+            $this->_rspErr(1, 'item_id参数错误');
             return;
         }
         $types = array(mt\Item::HERO_TYPE,
                        mt\Item::HERO_SKIN_TYPE,
                        mt\Item::GUN_SKIN_TYPE);
         if (!mt\Item::inTypes($itemMeta, $types)) {
-            $this->_rspErr(1, 'cost_item_id参数错误');
+            $this->_rspErr(1, 'item_id参数错误');
             return;
         }
         {
@@ -130,7 +130,7 @@ class ShopController extends BaseAuthedController {
             break;
             default:
             {
-                $this->_rspErr(1, 'cost_item_id参数错误');
+                $this->_rspErr(1, 'item_id参数错误');
                 return;
             }
             break;
@@ -193,7 +193,7 @@ class ShopController extends BaseAuthedController {
             if ($costGroup) {
                 return;
             }
-            if (count($val) > 0 && $val[0]['cost_item_id'] == $costItemId) {
+            if (count($val) > 0 && $val[0]['item_id'] == $costItemId) {
                 $costGroup = $val;
                 return;
             }
@@ -203,19 +203,19 @@ class ShopController extends BaseAuthedController {
         }
         $costItems = array();
         array_walk($costGroup, function ($val) use (&$costItems, $priceInfo) {
-            if ($val['cost_item_is_discount'] &&
+            if ($val['is_discount'] &&
                 $priceInfo['discount'] > 0 &&
                 $this->_getNowTime() >= $priceInfo['discount_begin_time'] &&
                 $this->_getNowTime() <= $priceInfo['discount_end_time']
             ) {
                 array_push($costItems, array(
-                    'item_id' => $val['cost_item_id'],
-                    'item_num' => (int)($val['cost_item_num'] * ($priceInfo['discount'] / 100)),
+                    'item_id' => $val['item_id'],
+                    'item_num' => (int)($val['item_num'] * ($priceInfo['discount'] / 100)),
                 ));
             } else {
                 array_push($costItems, array(
-                    'item_id' => $val['cost_item_id'],
-                    'item_num' => $val['cost_item_num'],
+                    'item_id' => $val['item_id'],
+                    'item_num' => $val['item_num'],
                 ));
             }
         });
diff --git a/webapp/mt/Item.php b/webapp/mt/Item.php
index 7e1e28f..1f24ee8 100644
--- a/webapp/mt/Item.php
+++ b/webapp/mt/Item.php
@@ -91,17 +91,17 @@ class Item {
         if ($meta['gold'] > 0) {
             array_push($info['price_info']['cost_list'],
                        array(
-                           'cost_item_id' => V_ITEM_GOLD,
-                           'cost_item_num' => $meta['gold'],
-                           'cost_item_is_discount' => 1
+                           'item_id' => V_ITEM_GOLD,
+                           'item_num' => $meta['gold'],
+                           'is_discount' => 1
                        ));
         }
         if ($meta['diamond_price'] > 0) {
             array_push($info['price_info']['cost_list'],
                        array(
-                           'cost_item_id' => V_ITEM_DIAMOND,
-                           'cost_item_num' => $meta['diamond_price'],
-                           'cost_item_is_discount' => 1
+                           'item_id' => V_ITEM_DIAMOND,
+                           'item_num' => $meta['diamond_price'],
+                           'is_discount' => 1
                        ));
         }
         return $info;