diff --git a/application/admin/controller/PublicShow.php b/application/admin/controller/PublicShow.php
index daa505b..ec81573 100644
--- a/application/admin/controller/PublicShow.php
+++ b/application/admin/controller/PublicShow.php
@@ -11,16 +11,15 @@ namespace app\admin\controller;
 class PublicShow extends Base {
 
     public function show_404(){
-        $this->assign('title', '页面丢失了！');
-        return $this->fetch('public/404');
+        if( !$this->request->isAjax() ){
+            $this->assign('title', '页面丢失了！');
+            return $this->fetch('public/404');
+        }else{
+            $this->error('页面不存在！');
+        }
     }
 
     public function show_500(){
         return $this->fetch('public/500');
     }
-
-    public function showBreadcrumb(){
-
-    }
-
 }
\ No newline at end of file
diff --git a/application/install/view/index/step3.html b/application/install/view/index/step3.html
index 794ecb9..b97f211 100644
--- a/application/install/view/index/step3.html
+++ b/application/install/view/index/step3.html
@@ -50,7 +50,7 @@
             </tbody>
         </table>
         <table class="table table-hover">
-            <caption><h4>数据库依赖检测</h4></caption>
+            <caption><h4>数据库依赖检查</h4></caption>
             <thead>
             <tr>
                 <th>名称</th>
@@ -68,7 +68,7 @@
         </table>
         {if condition="isset($checkCache)"}
         <table class="table table-hover">
-            <caption><h4>缓存依赖检测</h4></caption>
+            <caption><h4>缓存依赖检查</h4></caption>
             <thead>
             <tr>
                 <th>名称</th>