diff --git a/app/Controller/Api/SystemController.php b/app/Controller/Api/SystemController.php
index 4f08d03..cc397a6 100644
--- a/app/Controller/Api/SystemController.php
+++ b/app/Controller/Api/SystemController.php
@@ -22,4 +22,9 @@ class SystemController extends AbstractController
     {
         return (new SiteListService)->handle();
     }
+
+    public function getCityList()
+    {
+        return (new SiteListService)->handle();
+    }
 }
diff --git a/app/Service/Api/System/CityListService.php b/app/Service/Api/System/CityListService.php
new file mode 100644
index 0000000..e3b8dc0
--- /dev/null
+++ b/app/Service/Api/System/CityListService.php
@@ -0,0 +1,19 @@
+<?php
+/**
+ * This service file is part of item.
+ *
+ * @author   ctexthuang
+ * @contact  ctexthuang@qq.com
+ */
+
+declare(strict_types=1);
+
+namespace App\Service\Api\System;
+
+class CityListService extends
+{
+    public function handle()
+    {
+        //todo Write logic
+    }
+}
\ No newline at end of file
diff --git a/app/Service/Api/System/SiteListService.php b/app/Service/Api/System/SiteListService.php
index 95aac2e..38089d6 100644
--- a/app/Service/Api/System/SiteListService.php
+++ b/app/Service/Api/System/SiteListService.php
@@ -42,6 +42,9 @@ class SiteListService extends BaseService
         if (empty($list['data'])) return $this->return->success('success', ['list' => $list]);
 
         foreach ($list['data'] as &$item) {
+            $item['gap'] = 0;
+            if (empty($this->request->input('lng')) || empty($this->request->input('lat'))) continue;
+
             $item['gap'] = SystemUtil::calculateDistance(
                 ['lng' => $this->request->input('lng'),'lat' => $this->request->input('lat')],
                 ['lng' => $item['lng'], 'lat' => $item['lat']]