diff --git a/app/Admin/Controllers/Activity/IndexController.php b/app/Admin/Controllers/Activity/IndexController.php
index 7309f65..b7b7e02 100644
--- a/app/Admin/Controllers/Activity/IndexController.php
+++ b/app/Admin/Controllers/Activity/IndexController.php
@@ -204,7 +204,7 @@ class IndexController extends AdminController
             if ($request->total < 0) {
                 $error = new MessageBag([
                     'title'   => '错误',
-                    'message' => '可发券总数必须大于0.',
+                    'message' => '可发券总数必须大于0',
                 ]);
 
                 return back()->withInput()->with(compact('error'));
diff --git a/app/Models/Activity.php b/app/Models/Activity.php
index c763c29..426dd5a 100644
--- a/app/Models/Activity.php
+++ b/app/Models/Activity.php
@@ -100,7 +100,7 @@ class Activity extends Model
     {
 
         try {
-            $code = '66406' . date('ymd') . mt_rand(100000, 999999);
+            $code = 'YSD' . date('ymd') . mt_rand(100000, 999999);
 
             if ($this->type == SELF::TYPE_EXTEND) {
                 $start_at = now();
diff --git a/packages/coupon/src/Action/ysd/YsdGrant.php b/packages/coupon/src/Action/ysd/YsdGrant.php
index 509eefb..c414d2d 100644
--- a/packages/coupon/src/Action/ysd/YsdGrant.php
+++ b/packages/coupon/src/Action/ysd/YsdGrant.php
@@ -22,7 +22,7 @@ class YsdGrant extends Init
             if (!$activity->status) {
                 return '发券失败,活动已经关闭。';
             }
-
+            
             if ($activity->type == Activity::TYPE_SCOPE && Carbon::now()->gt($activity->end_at)) {
                 return '发券失败,此活动已经结束。';
             }