diff --git a/library/think/config/driver/driver_interface.php b/library/think/config/driver/driver_interface.php
deleted file mode 100644
index 05da4bca..00000000
--- a/library/think/config/driver/driver_interface.php
+++ /dev/null
@@ -1,29 +0,0 @@
-<?php
-// +----------------------------------------------------------------------
-// | ThinkPHP [ WE CAN DO IT JUST THINK ]
-// +----------------------------------------------------------------------
-// | Copyright (c) 2006~2015 http://thinkphp.cn All rights reserved.
-// +----------------------------------------------------------------------
-// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
-// +----------------------------------------------------------------------
-// | Author: dongww <dongww@gmail.com>
-// +----------------------------------------------------------------------
-
-namespace think\config\driver;
-
-/**
- * 配置文件解析驱动接口
- *
- * @package think\config\driver
- */
-interface DriverInterface
-{
-    /**
-     * 解析配置文件或内容，并以数组形式返回
-     *
-     * @param string $config 配置文件路径或字符串
-     *
-     * @return array 以数组形式返回配置
-     */
-    public function parse($config);
-}
diff --git a/library/think/config/driver/ini.php b/library/think/config/driver/ini.php
index f5caf6d3..44324dee 100644
--- a/library/think/config/driver/ini.php
+++ b/library/think/config/driver/ini.php
@@ -11,7 +11,7 @@
 
 namespace think\config\driver;
 
-class Ini implements DriverInterface
+class Ini
 {
     public function parse($config)
     {
diff --git a/library/think/config/driver/xml.php b/library/think/config/driver/xml.php
index 9c060b18..a0ad8402 100644
--- a/library/think/config/driver/xml.php
+++ b/library/think/config/driver/xml.php
@@ -11,7 +11,7 @@
 
 namespace think\config\driver;
 
-class Xml implements DriverInterface
+class Xml
 {
     public function parse($config)
     {