diff --git a/doc/_common.py b/doc/_common.py
index ee2f9b97..b1e164a0 100644
--- a/doc/_common.py
+++ b/doc/_common.py
@@ -54,6 +54,7 @@ class SystemCurrency(object):
             ['original_price', 0, '原价'],
             ['discount_price', 0, '折后价'],
             ['discount_rate', 0, '折扣百分比（0-100）'],
+            ['decimals', 0, '小数位数'],
             ['contract_address', 0, '合约地址'],
         ]
 
diff --git a/webapp/controller/MarketController.class.php b/webapp/controller/MarketController.class.php
index 9ed9b2e6..4fff56e0 100644
--- a/webapp/controller/MarketController.class.php
+++ b/webapp/controller/MarketController.class.php
@@ -18,6 +18,8 @@ use models\BoxOrder;
 use models\Nft;
 use models\BuyRecord;
 
+const CURRENCY_DECIMALS = 8;
+
 class MarketController extends BaseController {
 
     private function isTestMode()
@@ -93,6 +95,9 @@ class MarketController extends BaseController {
                     myself()->_rspErr(500, 'server internal error');
                     return;
                 }
+                $originalPrice = $meta['price'] * pow(10, CURRENCY_DECIMALS);
+                $discountPrice = $meta['discount'] * 100 > 0 ?
+                               $originalPrice * $meta['discount'] : $meta['price'];
                 $saleBox = array(
                     'box_id' => $boxId,
                     'item_id' => $meta['item_id'],
@@ -101,10 +106,10 @@ class MarketController extends BaseController {
                     'currency_list' => array(
                         array(
                             'name' => $currencyMeta['name'],
-                            'original_price' => $meta['price'],
-                            'discount_price' => $meta['discount'] * 100 > 0 ?
-                            $meta['price'] * $meta['discount'] : $meta['price'],
+                            'original_price' => $originalPrice,
+                            'discount_price' => $discountPrice,
                             'discount_rate' => $meta['discount'],
+                            'decimals' => CURRENCY_DECIMALS,
                             'contract_address' => $currencyMeta['address'],
                         )
                     )