diff --git a/library/think/Loader.php b/library/think/Loader.php
index 9451db66..90780d04 100644
--- a/library/think/Loader.php
+++ b/library/think/Loader.php
@@ -452,13 +452,14 @@ class Loader
     }
 
     /**
-     * 实例化数据库
-     * @param mixed $config 数据库配置
-     * @return object
+     * 数据库初始化 并取得数据库类实例
+     * @param mixed         $config 数据库配置
+     * @param bool|string   $name 连接标识 true 强制重新连接
+     * @return \think\db\Connection
      */
-    public static function db($config = [])
+    public static function db($config = [], $name = false)
     {
-        return Db::connect($config);
+        return Db::connect($config, $name);
     }
 
     /**