diff --git a/application/install/controller/Index.php b/application/install/controller/Index.php
index 4adc7dc..1da3d54 100644
--- a/application/install/controller/Index.php
+++ b/application/install/controller/Index.php
@@ -77,7 +77,7 @@ class Index extends Controller {
 
     public function step3(){
         $step = session('step');
-        if( $step != 2){
+        if( $step != 2 && $step != 3 ){
             $this->error("请按顺序安装", url('index'));
         }else{
             session('step', 3);
@@ -110,6 +110,7 @@ class Index extends Controller {
             if( $step != 3){
                 $this->error("请按顺序安装", url('index'));
             }else{
+                session('step', 4);
                 session('error', false);
                 echo $this->fetch();
                 $dbConfig = session('dbConfig');
@@ -154,7 +155,6 @@ class Index extends Controller {
                 if(session('error')){
                     $this->error('安装出错', url('index'));
                 }else{
-                    session('step', 4);
                     $str = "<meta http-equiv='Refresh' content='0;URL=".url('complete')."'>";
                     exit($str);
                 }
diff --git a/public/admin/index.php b/public/admin/index.php
index cafa48a..be2ab65 100644
--- a/public/admin/index.php
+++ b/public/admin/index.php
@@ -9,9 +9,13 @@
 // | Author: liu21st <liu21st@gmail.com>
 // +----------------------------------------------------------------------
 
-// [ 应用入口文件 ]
-define('BIND_MODULE','admin');
 // 定义应用目录
 define('APP_PATH', __DIR__ . '/../../application/');
+// [ 应用入口文件 ]
+if(file_exists(APP_PATH .'extra' . DIRECTORY_SEPARATOR . 'install.lock') === false){
+    define('BIND_MODULE','install');
+}else{
+    define('BIND_MODULE','admin');
+}
 // 加载框架引导文件
 require __DIR__ . '/../../thinkphp/start.php';
diff --git a/public/admin/install.php b/public/admin/install.php
deleted file mode 100644
index be11443..0000000
--- a/public/admin/install.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-// +----------------------------------------------------------------------
-// | ThinkPHP [ WE CAN DO IT JUST THINK ]
-// +----------------------------------------------------------------------
-// | Copyright (c) 2006-2016 http://thinkphp.cn All rights reserved.
-// +----------------------------------------------------------------------
-// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
-// +----------------------------------------------------------------------
-// | Author: liu21st <liu21st@gmail.com>
-// +----------------------------------------------------------------------
-
-// [ 应用入口文件 ]
-define('BIND_MODULE','install');
-// 定义应用目录
-define('APP_PATH', __DIR__ . '/../../application/');
-// 加载框架引导文件
-require __DIR__ . '/../../thinkphp/start.php';