diff --git a/extend/seven/behavior/GetSiteId.php b/extend/seven/behavior/GetSiteId.php
new file mode 100644
index 00000000..1f7e4e6b
--- /dev/null
+++ b/extend/seven/behavior/GetSiteId.php
@@ -0,0 +1,35 @@
+<?php
+/**
+ * @desc: 获取管理员能管理的站点
+ * @Author: Dr.Xing <ezfwork@foxmail.com>
+ * @Since: 2018/2/1 21:43
+ */
+
+namespace seven\behavior;
+
+use think\Session;
+
+class GetSiteId
+{
+    public function run()
+    {
+        $siteId = request()->param('user_site_id');
+        if(!is_null($siteId)) {
+            Session::set("user_site_id", $siteId);
+            return;
+        }
+        $auth =\app\admin\library\Auth::instance();
+        if($auth->isSuperAdmin()){
+            Session::delete("user_site_id");
+            return;
+        }
+        $user = $auth->getUserInfo();
+        $site = \app\common\model\Sites::get(['user_id'=>$user['id']]); //\think\Db::name('sites')->where('user_id', $user['id'])->find();
+        if($site!=false) {
+            Session::set("user_site_id", $site['id']);
+        }else{
+            Session::set("user_site_id", -1);
+        }
+    }
+
+}
\ No newline at end of file