diff --git a/app/Models/Activity.php b/app/Models/Activity.php
index 426dd5a..3954ffb 100644
--- a/app/Models/Activity.php
+++ b/app/Models/Activity.php
@@ -100,8 +100,8 @@ class Activity extends Model
     {
 
         try {
-            $code = 'YSD' . date('ymd') . mt_rand(100000, 999999);
-
+            //            $code = 'YSD' . date('ymd') . mt_rand(100000, 999999);
+            $code = '66406' . date('ymd') . mt_rand(100000, 999999);
             if ($this->type == SELF::TYPE_EXTEND) {
                 $start_at = now();
                 $end_at   = now()->addDays($this->days);