diff --git a/db/update17.2.sql b/db/update17.2.sql
index 766260a619..9ba6c77821 100644
--- a/db/update17.2.sql
+++ b/db/update17.2.sql
@@ -16,3 +16,6 @@ UPDATE `zt_approval` SET  `createdDate` = '';
 ALTER TABLE `zt_approval` CHANGE `createdDate` `createdDate` datetime NOT NULL AFTER `createdBy`;
 
 ALTER TABLE `zt_reviewissue` ADD `approval` MEDIUMINT  NOT NULL  AFTER `review`;
+
+ALTER TABLE `zt_approvalnode` ADD INDEX `idx_reviewed_date` (`reviewedDate`);
+
diff --git a/db/zentao.sql b/db/zentao.sql
index 0b05f10896..808fa6805e 100755
--- a/db/zentao.sql
+++ b/db/zentao.sql
@@ -187,7 +187,8 @@ 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;
 -- DROP TABLE IF EXISTS `zt_approvalobject`;
 CREATE TABLE `zt_approvalobject` (