diff --git a/application/admin/model/Order.php b/application/admin/model/Order.php
index ec0076f..1036f48 100644
--- a/application/admin/model/Order.php
+++ b/application/admin/model/Order.php
@@ -3,6 +3,7 @@
 namespace app\admin\model;
 
 use app\admin\library\Auth;
+use app\common\services\RedisService;
 use think\Cache;
 use think\Model;
 use traits\model\SoftDelete;
@@ -289,11 +290,8 @@ class Order extends Model
         $date = date('ymd'); // 6 位日期
         $key = 'order_inc:' . date('Ymd');
 
-        $inc = Cache::store('redis')->inc($key); // 自增
-
-        // 设置 key 过期（防止 key 永久存在）
-        $handler = Cache::store('redis')->handler();
-        $handler->expire($key, 86400); // 设置 1 天过期
+        $redis = new RedisService(0);
+        $inc = $redis->incrWithExpire($key);
 
         if ($inc > 9999) {
             throw new \Exception('订单号已满');
diff --git a/application/common/services/RedisService.php b/application/common/services/RedisService.php
new file mode 100644
index 0000000..f1a1840
--- /dev/null
+++ b/application/common/services/RedisService.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace app\common\services;
+
+use think\Cache;
+
+class RedisService
+{
+    protected $redis;
+
+    /**
+     * @param int $db Redis数据库编号，默认 0
+     */
+    public function __construct(int $db = 0)
+    {
+        $this->redis = Cache::store('redis')->handler();
+        $this->redis->select($db);
+    }
+
+    public function incrWithExpire(string $key, int $expireSeconds = 86400)
+    {
+        $val = $this->redis->incr($key);
+        if ($val === 1) {
+            $this->redis->expire($key, $expireSeconds);
+        }
+        return $val;
+    }
+}
\ No newline at end of file