diff --git a/application/admin/model/shopro/commission/Level.php b/application/admin/model/shopro/commission/Level.php
index 5c2ba5d..8eeb49e 100755
--- a/application/admin/model/shopro/commission/Level.php
+++ b/application/admin/model/shopro/commission/Level.php
@@ -14,7 +14,8 @@ class Level extends Common
 
     protected $type = [
         'commission_rules' => 'json',
-        'upgrade_rules' => 'json'
+        'upgrade_rules' => 'json',
+        'coupon_rules' => 'json'
     ];
 
 }