diff --git a/security.sh b/security.sh
index abd67ce..64f072e 100644
--- a/security.sh
+++ b/security.sh
@@ -7,7 +7,7 @@ read -p "修改SSH端口：" sshport
 if [ "$myhostname" != '' ]
 then
 	sudo hostnamectl set-hostname ${myhostname}
-if [ "$sshport" != '' ]
+elif [ "$sshport" != '' && "$myhostname" != '' ]
 	then
 	#删除SSH端口
 	sed -i '/^#Port/'d /etc/ssh/sshd_config
diff --git a/synctime.sh b/synctime.sh
new file mode 100644
index 0000000..9451bfb
--- /dev/null
+++ b/synctime.sh
@@ -0,0 +1,18 @@
+#!/bin/bash
+#####		CentOS一键同步时间		#####
+#####		Author:xiaoz.me			#####
+#####		Update:2018-01-19		#####
+
+#放行端口
+sed -i "/udp -j DROP/i\-A OUTPUT -p udp -m udp --dport 123 -j ACCEPT" /etc/sysconfig/iptables
+service iptables restart
+#同步时间
+ntpdate -u  pool.ntp.org
+
+ntpd=(`which ntpdate`)
+
+#定时任务
+echo "*/20 * * * * ${ntpd} pool.ntp.org > /dev/null 2>&1" >> /var/spool/cron/root
+service crond reload
+
+echo "同步成功，当前时间:" date 
\ No newline at end of file