diff --git a/docs/zh-cn/README.md b/docs/zh-cn/README.md
index 74cc313..7cb99ac 100644
--- a/docs/zh-cn/README.md
+++ b/docs/zh-cn/README.md
@@ -12,24 +12,16 @@
  see more: https://github.com/genshen/wssocks#server-side.
 
 ## 使用示例:客户端
-1. 登录 n.ustb.edu.cn;
-
-2. 打开浏览器的 DevTools (以chrome为例), 获得当前页面(登录成功的n.ustb.edu.cn)的cookie, 主要是名为`wengine_vpn_ticket`的cookie;
-![](asserts/get-cookie.png)
-**声明**: 服务器端不会保存任何用户信息, 所有的信息(如cookie)均保存中用户客户端主机中。  
-
-3. 打开命令行,执行如下命令:
+1. 打开命令行,执行如下命令,运行客户端:
    > 下面命令中, `wssocks-ustb`可执行程序均指代包含`wssocks-plugin-ustb`插件功能的`wssocks`程序.
    ```bash
-   # macOS, linux
-   USTB_VPN=ON VPN_COOKIE=wengine_vpn_ticket=b28f9aabf8d4f3dd wssocks-ustb client --addr :1080 --remote ws://proxy.gensh.me
-   # windows powershell
-   $env:USTB_VPN='ON'; $env:VPN_COOKIE='wengine_vpn_ticket=b28f9aabf8d4f3dd'; wssocks-ustb client --addr :1080 --remote ws://proxy.gensh.me
+   wssocks-ustb client --addr :1080 --remote ws://proxy.gensh.me --vpn-enable
    ```
-   这里，设置了两个环境变量`USTB_VPN`与`VPN_COOKIE`, 分别说明当前环境是需要通过n.ustb.edu.cn连接校内网络的以及设置n.ustb.edu.cn网站的cookie。  
-   此外，客户端本地监听地址为`:1080`(即0.0.0.0:1080), 服务器端地址为`ws://proxy.gensh.me`。
+   以上命令通过启用`--vpn-enable`选项启用通过vpn连接校内到网络。
+   随后, 要求输入vpn的用户名和密码登录`n.ustb.edu.cn`以获取其cookie (用户名和密码也可以在命令中通过`--vpn-usernam`和`--vpn-password`选项指定)。  
+   此外，客户端默认本地监听地址为`:1080`(即0.0.0.0:1080), 服务器端地址为`ws://proxy.gensh.me`。
 
-4. 设置代理  
+2. 设置代理  
 使用socks代理客户端软件(如mac系统的全局代理功能), 设置代理地址。
 ![](asserts/mac-proxy.png)
 在mac中，勾选**socks代理**选项框, 并填入代理服务器的地址及端口(即wssocks客户端本地监听地址及端口)，保存生效。  
diff --git a/go.mod b/go.mod
index 7f31560..c9c0297 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,9 @@ module github.com/genshen/wssocks-plugin-ustb
 go 1.12
 
 require (
-	github.com/genshen/cmds v0.0.0-20181110071553-72099a07a84d
-	github.com/genshen/wssocks v0.1.0
+	github.com/genshen/cmds v0.0.0-20190410131841-986519260a65
+	github.com/genshen/wssocks v0.2.0
+	github.com/gorilla/websocket v1.4.0
+	github.com/howeyc/gopass v0.0.0-20170109162249-bf9dde6d0d2c
+	golang.org/x/crypto v0.0.0-20190404164418-38d8ce5564a5 // indirect
 )
diff --git a/go.sum b/go.sum
index a5f6a56..6cf47ae 100644
--- a/go.sum
+++ b/go.sum
@@ -1,8 +1,14 @@
-github.com/genshen/cmds v0.0.0-20181110071553-72099a07a84d h1:tlQcG70GfH1gr3DXjQqY0s6Y3zSfpcW64frduwMIUog=
-github.com/genshen/cmds v0.0.0-20181110071553-72099a07a84d/go.mod h1:Uo2P6VGNS7t++sjm8vO2AqK/AB2v/favOgOZB984Z3o=
-github.com/genshen/wssocks v0.1.0 h1:8weru0xsyyezlxLK6VF47BWku2CUcEXnDvsBRsCsd4U=
-github.com/genshen/wssocks v0.1.0/go.mod h1:N7XkxXk+/rRVqcxiAw4fRhwsb1cMSy6EpzaHiyQFvTA=
+github.com/genshen/cmds v0.0.0-20190410131841-986519260a65 h1:RYKhlk6k5qpQBZVaSi+azOINxxJRujYMGHVAdMstw+o=
+github.com/genshen/cmds v0.0.0-20190410131841-986519260a65/go.mod h1:Uo2P6VGNS7t++sjm8vO2AqK/AB2v/favOgOZB984Z3o=
+github.com/genshen/wssocks v0.2.0 h1:jHmXm2qMaWVblXo9awJCHdTDnroypdVDOHQzi2dHZ2Q=
+github.com/genshen/wssocks v0.2.0/go.mod h1:W02tOrZ61oQgnc5redw4yNzUxdN8yo2aQ3/+fzj2Li4=
 github.com/gorilla/websocket v1.4.0 h1:WDFjx/TMzVgy9VdMMQi2K2Emtwi2QcUQsztZ/zLaH/Q=
 github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
+github.com/howeyc/gopass v0.0.0-20170109162249-bf9dde6d0d2c h1:kQWxfPIHVLbgLzphqk3QUflDy9QdksZR4ygR807bpy0=
+github.com/howeyc/gopass v0.0.0-20170109162249-bf9dde6d0d2c/go.mod h1:lADxMC39cJJqL93Duh1xhAs4I2Zs8mKS89XWXFGp9cs=
 github.com/segmentio/ksuid v1.0.2 h1:9yBfKyw4ECGTdALaF09Snw3sLJmYIX6AbPJrAy6MrDc=
 github.com/segmentio/ksuid v1.0.2/go.mod h1:BXuJDr2byAiHuQaQtSKoXh1J0YmUDurywOXgB2w+OSU=
+golang.org/x/crypto v0.0.0-20190404164418-38d8ce5564a5 h1:bselrhR0Or1vomJZC8ZIjWtbDmn9OYFLX5Ik9alpJpE=
+golang.org/x/crypto v0.0.0-20190404164418-38d8ce5564a5/go.mod h1:WFFai1msRO1wXaEeE5yQxYXgSfI8pQAWXbQop6sCtWE=
+golang.org/x/sys v0.0.0-20190403152447-81d4e9dc473e h1:nFYrTHrdrAOpShe27kaFHjsqYSEQ0KWqdWLu3xuZJts=
+golang.org/x/sys v0.0.0-20190403152447-81d4e9dc473e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
diff --git a/vpn_plugin/auto_login.go b/vpn_plugin/auto_login.go
new file mode 100644
index 0000000..7da0522
--- /dev/null
+++ b/vpn_plugin/auto_login.go
@@ -0,0 +1,45 @@
+package vpn_plugin
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+)
+
+// auto login vpn and get cookie
+func vpnLogin(address, uname, passwd string) ([]*http.Cookie, error) {
+	form := url.Values{
+		"auth_type": {"local"},
+		"sms_code":  {""},
+		"username":  {uname},
+		"password":  {passwd},
+	}
+
+	hc := http.Client{
+		// disable redirection
+		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+			return http.ErrUseLastResponse
+		},
+	}
+	req, err := http.NewRequest("POST", address, strings.NewReader(form.Encode())) // // todo missing http.
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
+
+	if resp, err := hc.Do(req); err != nil {
+		return nil, err
+	} else {
+		defer resp.Body.Close()
+		cookies := resp.Cookies()
+		// return cookies or error.
+		if len(cookies) == 0 {
+			return nil, errors.New(fmt.Sprintf("no cookie while auto login to %s ", address))
+		} else {
+			return cookies, nil
+		}
+	}
+}
diff --git a/vpn_plugin/vpn.go b/vpn_plugin/vpn.go
index 4f26717..429c1a2 100644
--- a/vpn_plugin/vpn.go
+++ b/vpn_plugin/vpn.go
@@ -1,9 +1,16 @@
 package vpn_plugin
 
 import (
+	"bufio"
+	"errors"
 	"fmt"
+	"github.com/genshen/cmds"
+	"github.com/genshen/wssocks/client"
+	"github.com/gorilla/websocket"
+	"github.com/howeyc/gopass"
 	"net"
 	"net/http"
+	"net/http/cookiejar"
 	"net/url"
 	"os"
 	"strings"
@@ -11,16 +18,69 @@ import (
 
 const USTBVpnHost = "n.ustb.edu.cn"
 const USTBVpnHttpScheme = "http"
+const USTBVpnLoginUrl = USTBVpnHttpScheme + "://" + USTBVpnHost + "/do-login"
 const USTBVpnWSScheme = "ws"
 
-type UstbVpn struct{}
+type UstbVpn struct {
+	enable    bool
+	username  string
+	password  string
+	targetUrl string
+}
+
+// create a UstbVpn instance, and add necessary command options to client sub-command.
+func NewUstbVpn() *UstbVpn {
+	vpn := UstbVpn{}
+	// add more command options for client sub-command.
+	if ok, clientCmd := cmds.Find(client.CommandNameClient); ok {
+		clientCmd.FlagSet.BoolVar(&vpn.enable, "vpn-enable", false, `enable USTB vpn feature.`)
+		clientCmd.FlagSet.StringVar(&vpn.username, "vpn-username", "", `username to login vpn.`)
+		clientCmd.FlagSet.StringVar(&vpn.password, "vpn-password", "", `password to login vpn.`)
+		clientCmd.FlagSet.StringVar(&vpn.targetUrl, "vpn-login-url", USTBVpnLoginUrl, `address to login vpn.`)
+	}
+	return &vpn
+}
 
-func (v *UstbVpn) BeforeRequest(url *url.URL, header http.Header) {
-	if os.Getenv("USTB_VPN") == "" {
-		return
+func (v *UstbVpn) BeforeRequest(dialer *websocket.Dialer, url *url.URL, header http.Header) error {
+	if !v.enable {
+		return nil
 	}
-	header.Add("Cookie", os.Getenv("VPN_COOKIE"))
+	// read username and password if they are empty.
+	if v.username == "" {
+		reader := bufio.NewReader(os.Stdin)
+		fmt.Print("Enter username: ")
+		if text, err := reader.ReadString('\n'); err != nil {
+			return errors.New("Whoops! Error while reading username:" + err.Error())
+		} else {
+			v.username = strings.TrimSuffix(text,"\n")
+		}
+	}
+	if v.password == "" {
+		fmt.Print("Enter Password: ")
+		if bytePassword, err := gopass.GetPasswd(); err != nil { // error
+			return errors.New("Whoops! Error while parsing password:" + err.Error())
+		} else {
+			v.password = string(bytePassword)
+		}
+	}
+
+	// change target url.
 	vpnUrl(url)
+	// add cookie
+	if cookies, err := vpnLogin(v.targetUrl, v.username, v.password); err != nil {
+		return err
+	} else {
+		if jar, err := cookiejar.New(nil); err != nil {
+			return err
+		} else {
+			dialer.Jar = jar
+			cookieUrl := *url
+			// replace url scheme "wss" to "https" and "ws"to "http"
+			cookieUrl.Scheme = strings.Replace(cookieUrl.Scheme, "ws", "http", 1)
+			dialer.Jar.SetCookies(&cookieUrl, cookies)
+			return nil
+		}
+	}
 }
 
 func vpnUrl(u *url.URL) {
diff --git a/wssocks-ustb/main.go b/wssocks-ustb/main.go
index e048413..80ddab9 100644
--- a/wssocks-ustb/main.go
+++ b/wssocks-ustb/main.go
@@ -4,7 +4,6 @@ import (
 	"github.com/genshen/cmds"
 	"github.com/genshen/wssocks-plugin-ustb/vpn_plugin"
 	"github.com/genshen/wssocks/client"
-	_ "github.com/genshen/wssocks/client"
 	_ "github.com/genshen/wssocks/server"
 	"log"
 	//_ "github.com/genshen/wssocks/version"
@@ -13,8 +12,8 @@ import (
 
 // initialize USTB vpn (n.ustb.edu.cn) plugin
 func init() {
-	vpn := vpn_plugin.UstbVpn{}
-	client.AddPluginRedirect(&vpn)
+	vpn := vpn_plugin.NewUstbVpn()
+	client.AddPluginRedirect(vpn)
 }
 
 func main() {
diff --git a/wssocks-ustb/version/version.go b/wssocks-ustb/version/version.go
index 1480ceb..3ba2305 100644
--- a/wssocks-ustb/version/version.go
+++ b/wssocks-ustb/version/version.go
@@ -7,7 +7,7 @@ import (
 	"github.com/genshen/wssocks/wss"
 )
 
-const VERSION = "0.1.0"
+const VERSION = "0.2.0"
 
 var versionCommand = &cmds.Command{
 	Name:        "version",
@@ -36,6 +36,6 @@ func (v *version) Run() error {
 	fmt.Printf("protocol version\t %d\n", wss.VersionCode)
 	fmt.Println("This is a socks5 proxy which allows you to visit internal network in USTB.")
 	fmt.Println("github https://github.com/genshen/wssocks-plugin-ustb")
-	fmt.Println("based on https://github.com/genshen/ws-socks")
+	fmt.Println("based on https://github.com/genshen/wssocks")
 	return nil
 }