diff --git a/library/think/db/Connection.php b/library/think/db/Connection.php
index fb38f6bc..bb2b02be 100644
--- a/library/think/db/Connection.php
+++ b/library/think/db/Connection.php
@@ -879,7 +879,6 @@ abstract class Connection
                 Debug::remark('queryEndTime', 'time');
                 $runtime = Debug::getRangeTime('queryStartTime', 'queryEndTime');
                 $sql     = $sql ?: $this->getLastsql();
-                $log     = $sql . ' [ RunTime:' . $runtime . 's ]';
                 $result  = [];
                 // SQL性能分析
                 if ($this->config['sql_explain'] && 0 === stripos(trim($sql), 'select')) {