diff --git a/app/common/service/UsedCarService.php b/app/common/service/UsedCarService.php
index b7afd1e..ddd7cb8 100644
--- a/app/common/service/UsedCarService.php
+++ b/app/common/service/UsedCarService.php
@@ -10,6 +10,7 @@ use support\exception\BusinessException;
 use support\Log;
 use support\Request;
 use app\common\model\User;
+use support\Redis;
 
 class UsedCarService
 {
@@ -106,10 +107,13 @@ class UsedCarService
     }
 
     public function getcode($userId){
+        $userCount =  Redis::get('used_car_count_'.$userId, 0);
         $todayStart = strtotime('today');
         $count = UsedCar::where('user_id',$userId)->where('created_at','>=',$todayStart)->count();
+        $count = $count<$userCount ? $userCount +1 : $count +1;
         $countCode = str_pad($count, 3, '0', STR_PAD_LEFT);
         $userCode = str_pad($userId, 3, '0', STR_PAD_LEFT);
+        Redis::set('used_car_count_'.$userId, $count, 86400);
         $user = User::where('id',$userId)->first();
         $nameInitials = $this->getNameInitials($user['name']);
         return $nameInitials . $userCode . date('Ymd') . $countCode;