diff --git a/database/maildb.sql b/database/maildb.sql
index 83886056..221e435d 100644
--- a/database/maildb.sql
+++ b/database/maildb.sql
@@ -52,8 +52,7 @@ CREATE TABLE `t_mail` (
   `expiretime` int(11) NOT NULL DEFAULT '0' COMMENT '过期时间',
   `createtime` int(11) NOT NULL DEFAULT '0' COMMENT '创建时间',
   `modifytime` int(11) NOT NULL DEFAULT '0' COMMENT '修改时间',
-  PRIMARY KEY (`idx`),
-  UNIQUE KEY `mail_id` (`mail_id`)
+  PRIMARY KEY (`mail_id`)
 ) ENGINE=InnoDB AUTO_INCREMENT=10000 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
 /*!40101 SET character_set_client = @saved_cs_client */;
 /*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
@@ -74,7 +73,7 @@ CREATE TABLE `t_group` (
   `deleted` int(11) NOT NULL DEFAULT '0' COMMENT '是否已删除',
   `createtime` int(11) NOT NULL DEFAULT '0' COMMENT '创建时间',
   `modifytime` int(11) NOT NULL DEFAULT '0' COMMENT '修改时间',
-  PRIMARY KEY (`idx`)
+  PRIMARY KEY (`group_id`)
 ) ENGINE=InnoDB AUTO_INCREMENT=10000 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
 /*!40101 SET character_set_client = @saved_cs_client */;
 /*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
@@ -93,7 +92,7 @@ CREATE TABLE `t_member` (
   `deleted` int(11) NOT NULL DEFAULT '0' COMMENT '是否已删除',
   `createtime` int(11) NOT NULL DEFAULT '0' COMMENT '创建时间',
   `modifytime` int(11) NOT NULL DEFAULT '0' COMMENT '修改时间',
-  PRIMARY KEY (`idx`)
+  PRIMARY KEY (`group_id`, `mebmer_id`)
 ) ENGINE=InnoDB AUTO_INCREMENT=10000 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
 /*!40101 SET character_set_client = @saved_cs_client */;
 /*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
@@ -113,8 +112,7 @@ CREATE TABLE `t_inbox` (
   `expiretime` int(11) NOT NULL DEFAULT '0' COMMENT '过期时间',
   `createtime` int(11) NOT NULL DEFAULT '0' COMMENT '创建时间',
   `modifytime` int(11) NOT NULL DEFAULT '0' COMMENT '修改时间',
-  PRIMARY KEY (`idx`),
-  UNIQUE KEY `idx_account_id_mail_id` (`account_id`, `mail_id`),
+  PRIMARY KEY (`account_id`, `mail_id`),
   KEY `idx_state` (`state`),
   KEY `idx_expiretime` (`expiretime`)
 ) ENGINE=InnoDB AUTO_INCREMENT=10000 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;