diff --git a/webapp/controller/MarketController.class.php b/webapp/controller/MarketController.class.php
index 297af70a..5a587dc4 100644
--- a/webapp/controller/MarketController.class.php
+++ b/webapp/controller/MarketController.class.php
@@ -22,16 +22,16 @@ use models\Nft;
 use models\BuyRecord;
 use services\MarketService;
 
-const CURRENCY_DECIMALS = 8;
-const PRICE_PAD = '0000000000';
-
-const PRESALE_NOT_STARTED = 0;
-const PRESALE_PREPARE = 1;
-const PRESALE_STARTED = 2;
-const PRESALE_SOLD_OUT = 3;
-
 class MarketController extends BaseController {
 
+    const CURRENCY_DECIMALS = 8;
+    const PRICE_PAD = '0000000000';
+
+    const PRESALE_NOT_STARTED = 0;
+    const PRESALE_PREPARE = 1;
+    const PRESALE_STARTED = 2;
+    const PRESALE_SOLD_OUT = 3;
+
     private function isTestMode()
     {
         return isset($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] == 443 && SERVER_ENV == _TEST;
@@ -47,7 +47,7 @@ class MarketController extends BaseController {
                 'countdown' => 0,
                 'sold_num' => 0,
                 'total_num' => 0,
-                'state' => PRESALE_NOT_STARTED,
+                'state' => self::PRESALE_NOT_STARTED,
                 'title' => $this->escapeString(mt\Parameter::getVal('pre_sale_not_started_title', '')),
                 'hint' => $this->escapeString(mt\Parameter::getVal('pre_sale_not_started_hint', '')),
                 'buyable_list' => array(),
@@ -64,16 +64,16 @@ class MarketController extends BaseController {
         $totalNum = $currBatchMeta['number_of_props'];
         $buyed = $this->isTestMode() ? 0 : BoxOrder::isBuyed($account, $currBatchMeta['id']);
         $title = '';
-        $state = PRESALE_PREPARE;
+        $state = self::PRESALE_PREPARE;
         if ($countdown > 0) {
-            $state = PRESALE_PREPARE;
+            $state = self::PRESALE_PREPARE;
         } else {
             if ($soldNum >= $totalNum) {
                 $title = $this->escapeString($currBatchMeta['end_title']);
-                $state = PRESALE_SOLD_OUT;
+                $state = self::PRESALE_SOLD_OUT;
             } else {
                 $title = $this->escapeString($currBatchMeta['begin_title']);
-                $state = PRESALE_STARTED;
+                $state = self::PRESALE_STARTED;
             }
         }
         $presaleInfo = array(
@@ -156,7 +156,7 @@ class MarketController extends BaseController {
                     myself()->_rspErr(500, 'server internal error');
                     return;
                 }
-                $originalPrice = $meta['price'] * pow(10, CURRENCY_DECIMALS);
+                $originalPrice = $meta['price'] * pow(10, self::CURRENCY_DECIMALS);
                 $discountPrice = $meta['discount'] * 100 > 0 ?
                                $originalPrice * $meta['discount'] : $originalPrice;
                 $saleBox = array(
@@ -171,7 +171,7 @@ class MarketController extends BaseController {
                             'original_price' => $originalPrice,
                             'discount_price' => $discountPrice,
                             'discount_rate' => $meta['discount'],
-                            'decimals' => CURRENCY_DECIMALS,
+                            'decimals' => self::CURRENCY_DECIMALS,
                             'contract_address' => $currencyMeta['address'],
                         )
                     )
@@ -251,11 +251,11 @@ class MarketController extends BaseController {
             myself()->_rspErr(500, 'not white list user');
             return;
         }
-        $originalPrice = $goodsMeta['price'] * pow(10, CURRENCY_DECIMALS);
+        $originalPrice = $goodsMeta['price'] * pow(10, self::CURRENCY_DECIMALS);
         $discountPrice = $goodsMeta['discount'] * 100 > 0 ?
                        $originalPrice * $goodsMeta['discount'] : $originalPrice;
 
-        $discountPrice .= PRICE_PAD;
+        $discountPrice .= self::PRICE_PAD;
         error_log('price:' . $price . ' discountPrice:' . $discountPrice);
         if (!$discountPrice || strcmp($price, $discountPrice) != 0) {
             myself()->_rspErr(500, 'price error');