diff --git a/var/Typecho/Request.php b/var/Typecho/Request.php
index 257e5727..dca840ac 100644
--- a/var/Typecho/Request.php
+++ b/var/Typecho/Request.php
@@ -803,17 +803,6 @@ class Typecho_Request
         return 'XMLHttpRequest' == $this->getServer('HTTP_X_REQUESTED_WITH');
     }
 
-    /**
-     * 判断是否为flash
-     *
-     * @access public
-     * @return boolean
-     */
-    public function isFlash(): bool
-    {
-        return 'Shockwave Flash' == $this->getServer('USER_AGENT');
-    }
-
     /**
      * 判断输入是否满足要求
      *