diff --git a/CHANGELOG b/CHANGELOG
index 2b514f0..ed392d3 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,10 @@
 proxy更新日志
 
+v6.3
+1.fixed #156
+2.修复DNS代理,没有定时保存缓存结果到文件.重启会降低查询速度.
+
+
 v6.2
 1.修复encrypt.Conn释放内存,导致的潜在panic问题.
 2.修复了basic认证,处理认证文件没有正确处理注释的bug.
diff --git a/README_ZH.md b/README_ZH.md
index c2b00e7..69ea45d 100644
--- a/README_ZH.md
+++ b/README_ZH.md
@@ -171,21 +171,27 @@ Proxy是golang实现的高性能http,https,websocket,tcp,udp,socks5,ss代理服
 提示:所有操作需要root权限.  
 #### 自动安装
 #### **0.如果你的VPS是linux64位的系统,那么只需要执行下面一句,就可以完成自动安装和配置.**  
+
 ```shell  
 curl -L https://raw.githubusercontent.com/snail007/goproxy/master/install_auto.sh | bash  
 ```  
+
 安装完成,配置目录是/etc/proxy,更详细的使用方法请参考上面的手册目录,进一步了解你想要使用的功能.  
 如果安装失败或者你的vps不是linux64位系统,请按照下面的半自动步骤安装:  
   
 #### 手动安装  
 
 #### **1.下载proxy**  
-下载地址:https://github.com/snail007/goproxy/releases  
+下载地址:https://github.com/snail007/goproxy/releases/latest   
+下面以v6.2为例,如果有最新版,请使用最新版链接.   
+
 ```shell  
 cd /root/proxy/  
 wget https://github.com/snail007/goproxy/releases/download/v6.2/proxy-linux-amd64.tar.gz  
 ```  
+
 #### **2.下载自动安装脚本**  
+
 ```shell  
 cd /root/proxy/  
 wget https://raw.githubusercontent.com/snail007/goproxy/master/install.sh  
diff --git a/VERSION b/VERSION
index 913671c..1f2be2a 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-6.2
\ No newline at end of file
+6.3
\ No newline at end of file
diff --git a/install_auto.sh b/install_auto.sh
index 2823213..a9a6901 100755
--- a/install_auto.sh
+++ b/install_auto.sh
@@ -5,7 +5,10 @@ if [ -e /tmp/proxy ]; then
 fi
 mkdir /tmp/proxy
 cd /tmp/proxy
-wget https://github.com/snail007/goproxy/releases/download/v6.2/proxy-linux-amd64.tar.gz
+
+LAST_VERSION=$(curl --silent "https://api.github.com/repos/snail007/goproxy/releases/latest" | grep -Po '"tag_name": "\K.*?(?=")')
+
+wget "https://github.com/snail007/goproxy/releases/download/${LAST_VERSION}/proxy-linux-amd64.tar.gz"
 
 # #install proxy
 tar zxvf proxy-linux-amd64.tar.gz
diff --git a/release.sh b/release.sh
index b6c2217..c8a6ebc 100755
--- a/release.sh
+++ b/release.sh
@@ -82,6 +82,3 @@ CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build $OPTS  -ldflags "$X" -o proxy.e
 
 rm -rf proxy proxy.exe proxy-noconsole.exe .cert
 
-#todo
-#1.install_auto.sh   goproxy/releases/download/vxxx
-#2.README        goproxy/releases/download/vxxx
diff --git a/sdk/android-ios/dns.go b/sdk/android-ios/dns.go
index 228f750..abd843f 100644
--- a/sdk/android-ios/dns.go
+++ b/sdk/android-ios/dns.go
@@ -57,6 +57,17 @@ func (s *DNS) CheckArgs() (err error) {
 func (s *DNS) InitService() (err error) {
 	s.cache = gocache.New(time.Second*time.Duration(*s.cfg.DNSTTL), time.Second*60)
 	s.cache.LoadFile(*s.cfg.CacheFile)
+	go func() {
+		for {
+			select {
+			case <-s.exitSig:
+				return
+			case <-time.After(time.Second * 300):
+				s.cache.DeleteExpired()
+				s.cache.SaveFile(*s.cfg.CacheFile)
+			}
+		}
+	}()
 	go func() {
 		defer func() {
 			if e := recover(); e != nil {