diff --git a/thinkphp/library/think/Request.php b/thinkphp/library/think/Request.php
index f6ac1ae6..b060f980 100644
--- a/thinkphp/library/think/Request.php
+++ b/thinkphp/library/think/Request.php
@@ -522,8 +522,14 @@ class Request
             return $this->server('REQUEST_METHOD') ?: 'GET';
         } elseif (!$this->method) {
             if (isset($_POST[Config::get('var_method')])) {
-                $this->method = strtoupper($_POST[Config::get('var_method')]);
-                $this->{$this->method}($_POST);
+                $method = strtoupper($_POST[Config::get('var_method')]);
+                if (in_array($method, ['GET', 'POST', 'DELETE', 'PUT', 'PATCH'])) {
+                    $this->method = $method;
+                    $this->{$this->method}($_POST);
+                } else {
+                    $this->method = 'POST';
+                }
+                unset($_POST[Config::get('var_method')]);
             } elseif (isset($_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE'])) {
                 $this->method = strtoupper($_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE']);
             } else {