diff --git a/convention.php b/convention.php
index 62ab0ea4..801c90a8 100644
--- a/convention.php
+++ b/convention.php
@@ -4,7 +4,8 @@ return [
     // +----------------------------------------------------------------------
     // | 应用设置
     // +----------------------------------------------------------------------
-
+    // 默认Host地址
+    'app_host'               => '',
     // 应用调试模式
     'app_debug'              => true,
     // 应用Trace
@@ -89,8 +90,6 @@ return [
     'url_route_must'         => false,
     // 域名部署
     'url_domain_deploy'      => false,
-    // 默认Host地址
-    'default_host'           => '',
     // 域名根，如thinkphp.cn
     'url_domain_root'        => '',
     // 是否自动转换URL中的控制器和操作名
diff --git a/library/think/Url.php b/library/think/Url.php
index a354b68c..51e2d89c 100644
--- a/library/think/Url.php
+++ b/library/think/Url.php
@@ -235,7 +235,7 @@ class Url
         $rootDomain = Config::get('url_domain_root');
         if (true === $domain) {
             // 自动判断域名
-            $domain = Config::get('default_host') ?: $request->host();
+            $domain = Config::get('app_host') ?: $request->host();
 
             $domains = Route::rules('domain');
             if ($domains) {
@@ -265,7 +265,7 @@ class Url
 
         } else {
             if (empty($rootDomain)) {
-                $host       = Config::get('default_host') ?: $request->host();
+                $host       = Config::get('app_host') ?: $request->host();
                 $rootDomain = substr_count($host, '.') > 1 ? substr(strstr($host, '.'), 1) : $host;
             }
             if (substr_count($domain, '.') < 2 && !strpos($domain, $rootDomain)) {