diff --git a/app/Models/Activity.php b/app/Models/Activity.php
index 27062ee..304ddf0 100644
--- a/app/Models/Activity.php
+++ b/app/Models/Activity.php
@@ -102,17 +102,28 @@ class Activity extends Model
         return $this->status;
     }
 
+    public function getCode($code = 'YSD200907684743')
+    {
+        //判断生成何种码
+        if ($this->channel == self::CHANNEL_UNION) {
+            $code = '66406' . date('ymdHi') . mt_rand(10000, 99999);
+        } else {
+            $code = 'YSD' . substr(date('ymd'), 1) . mt_rand(100000000, 999999999);
+        }
+
+        $exists = ActivityCoupon::where('code', $code)->exists();
+        if ($exists) {
+            return $this->getCode(null);
+        }
+
+        return $code;
+    }
+
     //发券
     public function grant($mobile, $outletId = null)
     {
-
         try {
-            //判断生成何种码
-            if ($this->channel == self::CHANNEL_UNION) {
-                $code = '66406' . date('ymdHi') . mt_rand(10000, 99999);
-            } else {
-                $code = 'YSD' . substr(date('ymdHi'), 1) . mt_rand(100, 999);
-            }
+            $code = $this->getCode();
 
             if ($this->type == SELF::TYPE_EXTEND) {
                 $start_at = now();