diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index 8c3fe9bf..9ed1cbd8 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -185,7 +185,7 @@ class Query
      */
     public function getLastSql()
     {
-        return $this->connection->queryStr;
+        return $this->connection->getLastSql();
     }
 
     /**