diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index 0e1ce67d..31bec497 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -1821,10 +1821,10 @@ class Query
 
     /**
      * 分析表达式（可用于查询或者写入操作）
-     * @access public
+     * @access protected
      * @return array
      */
-    public function parseExpress()
+    protected function parseExpress()
     {
         $options = $this->options;