diff --git a/convention.php b/convention.php
index c22a7bac..00ed0452 100644
--- a/convention.php
+++ b/convention.php
@@ -89,6 +89,8 @@ return [
     'url_route_must'         => false,
     // 域名部署
     'url_domain_deploy'      => false,
+    // 当前默认URL根地址
+    'default_url_root'       => '',
     // 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/Request.php b/library/think/Request.php
index ffd001f2..2712c742 100644
--- a/library/think/Request.php
+++ b/library/think/Request.php
@@ -132,6 +132,9 @@ class Request
         if (is_null($this->filter)) {
             $this->filter = Config::get('default_filter');
         }
+        if (Config::get('default_url_root')) {
+            $this->root(Config::get('default_url_root'));
+        }
         // 保存 php://input
         $this->input = file_get_contents('php://input');
     }