diff --git a/README.md b/README.md
index 3304cffc..05c1dfd0 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,10 @@ about the change automatically
 6. Please disable other proxy addons in your browser, or set them to use
 system proxy
 
+### Develop
+
+Visual Studio Express 2012 is recommended.
+
 #### License
 
 GPLv3
diff --git a/shadowsocks-csharp/3rd/SimpleJson.cs b/shadowsocks-csharp/3rd/SimpleJson.cs
index 2850137d..6581e84b 100644
--- a/shadowsocks-csharp/3rd/SimpleJson.cs
+++ b/shadowsocks-csharp/3rd/SimpleJson.cs
@@ -1035,13 +1035,13 @@ namespace SimpleJson
 
         protected static bool SerializeArray(IJsonSerializerStrategy jsonSerializerStrategy, IEnumerable anArray, StringBuilder builder)
         {
-            builder.Append("[");
+            builder.Append("[\r\n  ");
 
             bool first = true;
             foreach (object value in anArray)
             {
                 if (!first)
-                    builder.Append(",");
+                    builder.Append(",\r\n  ");
 
                 if (!SerializeValue(jsonSerializerStrategy, value, builder))
                     return false;
@@ -1049,7 +1049,7 @@ namespace SimpleJson
                 first = false;
             }
 
-            builder.Append("]");
+            builder.Append("\r\n]");
             return true;
         }
 
diff --git a/shadowsocks-csharp/Controller/GfwListUpdater.cs b/shadowsocks-csharp/Controller/GfwListUpdater.cs
new file mode 100644
index 00000000..7abe9445
--- /dev/null
+++ b/shadowsocks-csharp/Controller/GfwListUpdater.cs
@@ -0,0 +1,68 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Net;
+using System.IO;
+using Shadowsocks.Properties;
+using SimpleJson;
+using Shadowsocks.Util;
+
+namespace Shadowsocks.Controller
+{
+    public class GFWListUpdater
+    {
+        private const string GFWLIST_URL = "https://autoproxy-gfwlist.googlecode.com/svn/trunk/gfwlist.txt";
+
+        private static string PAC_FILE = PACServer.PAC_FILE;
+
+        public event EventHandler UpdateCompleted;
+
+        public event ErrorEventHandler Error;
+
+        private void http_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
+        {
+            try
+            {
+                List<string> lines = ParseResult(e.Result);
+
+                string abpContent = Utils.UnGzip(Resources.abp_js);
+                abpContent = abpContent.Replace("__RULES__", SimpleJson.SimpleJson.SerializeObject(lines));
+                File.WriteAllText(PAC_FILE, abpContent, Encoding.UTF8);
+                if (UpdateCompleted != null)
+                {
+                    UpdateCompleted(this, new EventArgs());
+                }
+            }
+            catch (Exception ex)
+            {
+                if (Error != null)
+                {
+                    Error(this, new ErrorEventArgs(ex));
+                }
+            }
+        }
+
+        public void UpdatePACFromGFWList()
+        {
+            WebClient http = new WebClient();
+            http.Proxy = new WebProxy(IPAddress.Loopback.ToString(), 8123);
+            http.DownloadStringCompleted += http_DownloadStringCompleted;
+            http.DownloadStringAsync(new Uri(GFWLIST_URL));
+        }
+
+        public List<string> ParseResult(string response)
+        {
+            byte[] bytes = Convert.FromBase64String(response);
+            string content = Encoding.ASCII.GetString(bytes);
+            string[] lines = content.Split(new char[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries);
+            List<string> valid_lines = new List<string>(lines.Length);
+            foreach (string line in lines)
+            {
+                if (line.StartsWith("!") || line.StartsWith("["))
+                    continue;
+                valid_lines.Add(line);
+            }
+            return valid_lines;
+        }
+    }
+}
\ No newline at end of file
diff --git a/shadowsocks-csharp/Controller/Logging.cs b/shadowsocks-csharp/Controller/Logging.cs
index 22b5b9b1..81f16dd8 100755
--- a/shadowsocks-csharp/Controller/Logging.cs
+++ b/shadowsocks-csharp/Controller/Logging.cs
@@ -17,8 +17,7 @@ namespace Shadowsocks.Controller
                 string temppath = Path.GetTempPath();
                 LogFile = Path.Combine(temppath, "shadowsocks.log");
                 FileStream fs = new FileStream(LogFile, FileMode.Append);
-                TextWriter tmp = Console.Out;
-                StreamWriter sw = new StreamWriter(fs);
+                StreamWriterWithTimestamp sw = new StreamWriterWithTimestamp(fs);
                 sw.AutoFlush = true;
                 Console.SetOut(sw);
                 Console.SetError(sw);
@@ -61,5 +60,30 @@ namespace Shadowsocks.Controller
                 Console.WriteLine(e);
             }
         }
+
+    }
+
+    // Simply extended System.IO.StreamWriter for adding timestamp workaround
+    public class StreamWriterWithTimestamp : StreamWriter
+    {
+        public StreamWriterWithTimestamp(Stream stream) : base(stream)
+        {
+        }
+
+        private string GetTimestamp()
+        {
+            return "[" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + "] ";
+        }
+
+        public override void WriteLine(string value)
+        {
+            base.WriteLine(GetTimestamp() + value);
+        }
+
+        public override void Write(string value)
+        {
+            base.Write(GetTimestamp() + value);
+        }
     }
+
 }
diff --git a/shadowsocks-csharp/Controller/PACServer.cs b/shadowsocks-csharp/Controller/PACServer.cs
index f02476ae..b2456e18 100755
--- a/shadowsocks-csharp/Controller/PACServer.cs
+++ b/shadowsocks-csharp/Controller/PACServer.cs
@@ -1,5 +1,6 @@
 using Shadowsocks.Model;
 using Shadowsocks.Properties;
+using Shadowsocks.Util;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
@@ -14,7 +15,7 @@ namespace Shadowsocks.Controller
     class PACServer
     {
         private static int PORT = 8093;
-        private static string PAC_FILE = "pac.txt";
+        public static string PAC_FILE = "pac.txt";
         private static Configuration config;
 
         Socket _listener;
@@ -130,19 +131,7 @@ namespace Shadowsocks.Controller
             }
             else
             {
-                byte[] pacGZ = Resources.proxy_pac_txt;
-                byte[] buffer = new byte[1024];  // builtin pac gzip size: maximum 100K
-                MemoryStream sb = new MemoryStream();
-                int n;
-                using (GZipStream input = new GZipStream(new MemoryStream(pacGZ),
-                    CompressionMode.Decompress, false))
-                {
-                    while((n = input.Read(buffer, 0, buffer.Length)) > 0)
-                    {
-                        sb.Write(buffer, 0, n);
-                    }
-                    return System.Text.Encoding.UTF8.GetString(sb.ToArray());
-                }
+                return Utils.UnGzip(Resources.proxy_pac_txt);
             }
         }
 
@@ -175,7 +164,7 @@ Connection: Close
 ", System.Text.Encoding.UTF8.GetBytes(pac).Length) + pac;
                     byte[] response = System.Text.Encoding.UTF8.GetBytes(text);
                     conn.BeginSend(response, 0, response.Length, 0, new AsyncCallback(SendCallback), conn);
-                    Util.Util.ReleaseMemory();
+                    Util.Utils.ReleaseMemory();
                 }
                 else
                 {
diff --git a/shadowsocks-csharp/Controller/ShadowsocksController.cs b/shadowsocks-csharp/Controller/ShadowsocksController.cs
index 080390be..1e193158 100755
--- a/shadowsocks-csharp/Controller/ShadowsocksController.cs
+++ b/shadowsocks-csharp/Controller/ShadowsocksController.cs
@@ -21,6 +21,7 @@ namespace Shadowsocks.Controller
         private PACServer pacServer;
         private Configuration _config;
         private PolipoRunner polipoRunner;
+        private GFWListUpdater gfwListUpdater;
         private bool stopped = false;
 
         private bool _systemProxyIsDirty = false;
@@ -38,6 +39,10 @@ namespace Shadowsocks.Controller
         // when user clicked Edit PAC, and PAC file has already created
         public event EventHandler<PathEventArgs> PACFileReadyToOpen;
 
+        public event EventHandler UpdatePACFromGFWListCompleted;
+
+        public event ErrorEventHandler UpdatePACFromGFWListError;
+
         public event ErrorEventHandler Errored;
 
         public ShadowsocksController()
@@ -151,6 +156,14 @@ namespace Shadowsocks.Controller
             return "ss://" + base64;
         }
 
+        public void UpdatePACFromGFWList()
+        {
+            if (gfwListUpdater != null)
+            {
+                gfwListUpdater.UpdatePACFromGFWList();
+            }
+        }
+
         protected void Reload()
         {
             // some logic in configuration updated the config when saving, we need to read it again
@@ -165,6 +178,12 @@ namespace Shadowsocks.Controller
                 pacServer = new PACServer();
                 pacServer.PACFileChanged += pacServer_PACFileChanged;
             }
+            if (gfwListUpdater == null)
+            {
+                gfwListUpdater = new GFWListUpdater();
+                gfwListUpdater.UpdateCompleted += pacServer_PACUpdateCompleted;
+                gfwListUpdater.Error += pacServer_PACUpdateError;
+            }
 
             pacServer.Stop();
 
@@ -208,7 +227,7 @@ namespace Shadowsocks.Controller
             }
 
             UpdateSystemProxy();
-            Util.Util.ReleaseMemory();
+            Util.Utils.ReleaseMemory();
         }
 
 
@@ -242,6 +261,18 @@ namespace Shadowsocks.Controller
             UpdateSystemProxy();
         }
 
+        private void pacServer_PACUpdateCompleted(object sender, EventArgs e)
+        {
+            if (UpdatePACFromGFWListCompleted != null)
+                UpdatePACFromGFWListCompleted(this, e);
+        }
+
+        private void pacServer_PACUpdateError(object sender, ErrorEventArgs e)
+        {
+            if (UpdatePACFromGFWListError != null)
+                UpdatePACFromGFWListError(this, e);
+        }
+
         private void StartReleasingMemory()
         {
             _ramThread = new Thread(new ThreadStart(ReleaseMemory));
@@ -253,7 +284,7 @@ namespace Shadowsocks.Controller
         {
             while (true)
             {
-                Util.Util.ReleaseMemory();
+                Util.Utils.ReleaseMemory();
                 Thread.Sleep(30 * 1000);
             }
         }
diff --git a/shadowsocks-csharp/Controller/UpdateChecker.cs b/shadowsocks-csharp/Controller/UpdateChecker.cs
index e71d95c9..7996a687 100755
--- a/shadowsocks-csharp/Controller/UpdateChecker.cs
+++ b/shadowsocks-csharp/Controller/UpdateChecker.cs
@@ -23,6 +23,7 @@ namespace Shadowsocks.Controller
         {
             // TODO test failures
             WebClient http = new WebClient();
+            http.Proxy = new WebProxy(IPAddress.Loopback.ToString(), 8123);
             http.DownloadStringCompleted += http_DownloadStringCompleted;
             http.DownloadStringAsync(new Uri(UpdateURL));
         }
@@ -145,7 +146,7 @@ namespace Shadowsocks.Controller
             }
             catch (Exception ex)
             {
-                Console.Write(ex.ToString());
+                Console.WriteLine(ex.ToString());
                 return;
             }
         }
diff --git a/shadowsocks-csharp/Data/abp.js.gz b/shadowsocks-csharp/Data/abp.js.gz
new file mode 100755
index 00000000..e049c0a4
Binary files /dev/null and b/shadowsocks-csharp/Data/abp.js.gz differ
diff --git a/shadowsocks-csharp/Data/cn.txt b/shadowsocks-csharp/Data/cn.txt
index 78f5d19e..cd9dfff9 100644
--- a/shadowsocks-csharp/Data/cn.txt
+++ b/shadowsocks-csharp/Data/cn.txt
@@ -4,8 +4,8 @@ Mode=代理模式
 PAC=PAC 模式
 Global=全局模式
 Servers=服务器选择
-Edit Servers...=编辑Shadowsocks服务器...
-Start on Boot=开机启动
+Edit Servers...=编辑Shadowsocks服务器...
+Start on Boot=开机启动
 Share over LAN=在局域网共享代理
 Edit PAC File...=编辑 PAC 文件...
 Show QRCode...=显示二维码...
@@ -39,6 +39,9 @@ Shadowsocks is here=Shadowsocks 在这里
 You can turn on/off Shadowsocks in the context menu=可以在右键菜单中开关 Shadowsocks
 Enabled=已启用代理
 Disabled=已禁用代理
+Update PAC from GFWList=从 GFWList 更新 PAC
+Failed to update PAC file =更新 PAC 文件失败
+PAC updated=更新 PAC 成功
 &Parse=解析(&P)
 Shadowsocks URI=Shadowsocks URI
 Shadowsocks URI Parse=Shadowsocks URI解析
diff --git a/shadowsocks-csharp/Program.cs b/shadowsocks-csharp/Program.cs
index 716e0df7..8ca485d7 100755
--- a/shadowsocks-csharp/Program.cs
+++ b/shadowsocks-csharp/Program.cs
@@ -18,7 +18,7 @@ namespace Shadowsocks
         [STAThread]
         static void Main()
         {
-            Util.Util.ReleaseMemory();
+            Util.Utils.ReleaseMemory();
             using (Mutex mutex = new Mutex(false, "Global\\" + "71981632-A427-497F-AB91-241CD227EC1F"))
             {
                 Application.EnableVisualStyles();
diff --git a/shadowsocks-csharp/Properties/Resources.Designer.cs b/shadowsocks-csharp/Properties/Resources.Designer.cs
index 25ea71a9..5139429f 100755
--- a/shadowsocks-csharp/Properties/Resources.Designer.cs
+++ b/shadowsocks-csharp/Properties/Resources.Designer.cs
@@ -61,6 +61,16 @@ namespace Shadowsocks.Properties {
         }
         
         /// <summary>
+        ///   Looks up a localized resource of type System.Byte[].
+        /// </summary>
+        internal static byte[] abp_js {
+            get {
+                object obj = ResourceManager.GetObject("abp_js", resourceCulture);
+                return ((byte[])(obj));
+            }
+        }
+        
+        /// <summary>
         ///   Looks up a localized string similar to Shadowsocks=Shadowsocks
         ///Enable=启用代理
         ///Mode=代理模式
@@ -68,7 +78,7 @@ namespace Shadowsocks.Properties {
         ///Global=全局模式
         ///Servers=服务器选择
         ///Edit Servers...=编辑服务器...
-        ///Start on Boot=自动启动
+        ///Start on Boot=开机启动
         ///Share over LAN=在局域网共享代理
         ///Edit PAC File...=编辑 PAC 文件...
         ///Show QRCode...=显示二维码...
diff --git a/shadowsocks-csharp/Properties/Resources.resx b/shadowsocks-csharp/Properties/Resources.resx
index d8fb470d..ee5f98ea 100755
--- a/shadowsocks-csharp/Properties/Resources.resx
+++ b/shadowsocks-csharp/Properties/Resources.resx
@@ -118,6 +118,9 @@
     <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
   <assembly alias="System.Windows.Forms" name="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
+  <data name="abp_js" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Data\abp.js.gz;System.Byte[], mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </data>
   <data name="cn" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\data\cn.txt;System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089;utf-8</value>
   </data>
diff --git a/shadowsocks-csharp/Util/Util.cs b/shadowsocks-csharp/Util/Util.cs
index afb5539a..15463a3a 100755
--- a/shadowsocks-csharp/Util/Util.cs
+++ b/shadowsocks-csharp/Util/Util.cs
@@ -1,12 +1,14 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.IO;
+using System.IO.Compression;
 using System.Runtime.InteropServices;
 using System.Text;
 
 namespace Shadowsocks.Util
 {
-    public class Util
+    public class Utils
     {
         public static void ReleaseMemory()
         {
@@ -22,6 +24,24 @@ namespace Shadowsocks.Util
                 (UIntPtr)0xFFFFFFFF, (UIntPtr)0xFFFFFFFF);
         }
 
+        public static string UnGzip(byte[] buf)
+        {
+            byte[] buffer = new byte[1024];
+            int n;
+            using (MemoryStream sb = new MemoryStream())
+            {
+                using (GZipStream input = new GZipStream(new MemoryStream(buf),
+                    CompressionMode.Decompress, false))
+                {
+                    while ((n = input.Read(buffer, 0, buffer.Length)) > 0)
+                    {
+                        sb.Write(buffer, 0, n);
+                    }
+                }
+                return System.Text.Encoding.UTF8.GetString(sb.ToArray());
+            }
+        }
+
         [DllImport("kernel32.dll")]
         [return: MarshalAs(UnmanagedType.Bool)]
         private static extern bool SetProcessWorkingSetSize(IntPtr process,
diff --git a/shadowsocks-csharp/View/MenuViewController.cs b/shadowsocks-csharp/View/MenuViewController.cs
index 8dae0dbb..43a7b8f5 100755
--- a/shadowsocks-csharp/View/MenuViewController.cs
+++ b/shadowsocks-csharp/View/MenuViewController.cs
@@ -45,6 +45,8 @@ namespace Shadowsocks.View
             controller.ShareOverLANStatusChanged += controller_ShareOverLANStatusChanged;
             controller.EnableGlobalChanged += controller_EnableGlobalChanged;
             controller.Errored += controller_Errored;
+            controller.UpdatePACFromGFWListCompleted += controller_UpdatePACFromGFWListCompleted;
+            controller.UpdatePACFromGFWListError += controller_UpdatePACFromGFWListError;
 
             _notifyIcon = new NotifyIcon();
             UpdateTrayIcon();
@@ -138,6 +140,7 @@ namespace Shadowsocks.View
                 this.AutoStartupItem = CreateMenuItem("Start on Boot", new EventHandler(this.AutoStartupItem_Click)),
                 this.ShareOverLANItem = CreateMenuItem("Share over LAN", new EventHandler(this.ShareOverLANItem_Click)),
                 CreateMenuItem("Edit PAC File...", new EventHandler(this.EditPACFileItem_Click)),
+                CreateMenuItem("Update PAC from GFWList", new EventHandler(this.UpdatePACFromGFWListItem_Click)),
                 new MenuItem("-"),
                 CreateMenuItem("Show QRCode...", new EventHandler(this.QRCodeItem_Click)),
                 CreateMenuItem("Show Logs...", new EventHandler(this.ShowLogItem_Click)),
@@ -176,19 +179,36 @@ namespace Shadowsocks.View
             System.Diagnostics.Process.Start("explorer.exe", argument);
         }
 
+        void ShowBalloonTip(string title, string content, ToolTipIcon icon, int timeout)
+        {
+            _notifyIcon.BalloonTipTitle = title;
+            _notifyIcon.BalloonTipText = content;
+            _notifyIcon.BalloonTipIcon = icon;
+            _notifyIcon.ShowBalloonTip(timeout);
+        }
+
+        void controller_UpdatePACFromGFWListError(object sender, System.IO.ErrorEventArgs e)
+        {
+            ShowBalloonTip(I18N.GetString("Failed to update PAC file"), e.GetException().Message, ToolTipIcon.Error, 5000);
+            Logging.LogUsefulException(e.GetException());
+        }
+
+        void controller_UpdatePACFromGFWListCompleted(object sender, EventArgs e)
+        {
+            ShowBalloonTip(I18N.GetString("Shadowsocks"), I18N.GetString("PAC updated"), ToolTipIcon.Info, 1000);
+        }
+
         void updateChecker_NewVersionFound(object sender, EventArgs e)
         {
-            _notifyIcon.BalloonTipTitle = String.Format(I18N.GetString("Shadowsocks {0} Update Found"), updateChecker.LatestVersionNumber);
-            _notifyIcon.BalloonTipText = I18N.GetString("Click here to download");
-            _notifyIcon.BalloonTipIcon = ToolTipIcon.Info;
+            ShowBalloonTip(String.Format(I18N.GetString("Shadowsocks {0} Update Found"), updateChecker.LatestVersionNumber), I18N.GetString("Click here to download"), ToolTipIcon.Info, 5000);
             _notifyIcon.BalloonTipClicked += notifyIcon1_BalloonTipClicked;
-            _notifyIcon.ShowBalloonTip(5000);
             _isFirstRun = false;
         }
 
         void notifyIcon1_BalloonTipClicked(object sender, EventArgs e)
         {
             System.Diagnostics.Process.Start(updateChecker.LatestVersionURL);
+            _notifyIcon.BalloonTipClicked -= notifyIcon1_BalloonTipClicked;
         }
 
 
@@ -245,7 +265,7 @@ namespace Shadowsocks.View
         void configForm_FormClosed(object sender, FormClosedEventArgs e)
         {
             configForm = null;
-            Util.Util.ReleaseMemory();
+            Util.Utils.ReleaseMemory();
             ShowFirstTimeBalloon();
         }
 
@@ -312,6 +332,11 @@ namespace Shadowsocks.View
             controller.TouchPACFile();
         }
 
+        private void UpdatePACFromGFWListItem_Click(object sender, EventArgs e)
+        {
+            controller.UpdatePACFromGFWList();
+        }
+
         private void AServerItem_Click(object sender, EventArgs e)
         {
             MenuItem item = (MenuItem)sender;
diff --git a/shadowsocks-csharp/shadowsocks-csharp.csproj b/shadowsocks-csharp/shadowsocks-csharp.csproj
index 67382138..3ee4a106 100755
--- a/shadowsocks-csharp/shadowsocks-csharp.csproj
+++ b/shadowsocks-csharp/shadowsocks-csharp.csproj
@@ -86,6 +86,7 @@
     <Compile Include="3rd\zxing\Version.cs" />
     <Compile Include="Controller\AutoStartup.cs" />
     <Compile Include="Controller\FileManager.cs" />
+    <Compile Include="Controller\GFWListUpdater.cs" />
     <Compile Include="Controller\I18N.cs" />
     <Compile Include="Controller\Logging.cs" />
     <Compile Include="Controller\UpdateChecker.cs" />
@@ -101,6 +102,11 @@
     <Compile Include="Controller\PACServer.cs" />
     <Compile Include="Model\Server.cs" />
     <Compile Include="Model\Configuration.cs" />
+    <Compile Include="Properties\Resources.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+      <DependentUpon>Resources.resx</DependentUpon>
+    </Compile>
     <Compile Include="Util\Util.cs" />
     <Compile Include="View\ConfigForm.cs">
       <SubType>Form</SubType>
@@ -133,14 +139,9 @@
     </EmbeddedResource>
     <EmbeddedResource Include="Properties\Resources.resx">
       <Generator>ResXFileCodeGenerator</Generator>
-      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
       <SubType>Designer</SubType>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
     </EmbeddedResource>
-    <Compile Include="Properties\Resources.Designer.cs">
-      <AutoGen>True</AutoGen>
-      <DependentUpon>Resources.resx</DependentUpon>
-      <DesignTime>True</DesignTime>
-    </Compile>
     <EmbeddedResource Include="View\QRCodeForm.resx">
       <DependentUpon>QRCodeForm.cs</DependentUpon>
     </EmbeddedResource>
@@ -151,6 +152,7 @@
     <None Include="app.manifest">
       <SubType>Designer</SubType>
     </None>
+    <None Include="Data\abp.js.gz" />
     <None Include="Data\libsscrypto.dll.gz" />
     <None Include="Data\polipo.exe.gz" />
     <None Include="Data\proxy.pac.txt.gz" />