diff --git a/library/think/Request.php b/library/think/Request.php
index eac0237f51..47356ecd92 100644
--- a/library/think/Request.php
+++ b/library/think/Request.php
@@ -526,6 +526,8 @@ public function method($method = false)
                 if (in_array($method, ['GET', 'POST', 'DELETE', 'PUT', 'PATCH'])) {
                     $this->method = $method;
                     $this->{$this->method}($_POST);
+                } else {
+                    $this->method = 'POST';
                 }
             } elseif (isset($_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE'])) {
                 $this->method = strtoupper($_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE']);