diff --git a/db/standard/zentao17.3.sql b/db/standard/zentao17.3.sql
index 65d576ef4b..0eacd14b36 100644
--- a/db/standard/zentao17.3.sql
+++ b/db/standard/zentao17.3.sql
@@ -217,7 +217,8 @@ CREATE TABLE `zt_approvalnode` (
   `extra` mediumtext NOT NULL,
   `reviewedBy` char(30) NOT NULL,
   `reviewedDate` datetime NOT NULL,
-  PRIMARY KEY (`id`)
+  PRIMARY KEY (`id`),
+  KEY `idx_reviewed_date` (`reviewedDate`)
 ) ENGINE=MyISAM DEFAULT CHARSET=utf8;
 CREATE TABLE `zt_approvalobject` (
   `id` int(8) NOT NULL AUTO_INCREMENT,