diff --git a/Netch/Forms/MainForm.Control.cs b/Netch/Forms/MainForm.Control.cs
index 100a6925..3b93bdfa 100644
--- a/Netch/Forms/MainForm.Control.cs
+++ b/Netch/Forms/MainForm.Control.cs
@@ -20,7 +20,7 @@ namespace Netch.Forms
             SaveConfigs();
             if (State == State.Waiting || State == State.Stopped)
             {
-                // 服务器、模式 需选择
+                #region 服务器、模式 需选择
                 if (ServerComboBox.SelectedIndex == -1)
                 {
                     MessageBoxX.Show(i18N.Translate("Please select a server first"));
@@ -32,8 +32,30 @@ namespace Netch.Forms
                     MessageBoxX.Show(i18N.Translate("Please select an mode first"));
                     return;
                 }
+                #endregion
 
-                //MenuStrip.Enabled = ConfigurationGroupBox.Enabled = ControlButton.Enabled = SettingsButton.Enabled = false;
+                #region 检查端口是否被占用
+                if (PortHelper.PortInUse(Global.Settings.Socks5LocalPort))
+                {
+                    MessageBoxX.Show("The Socks5 port is in use. Click OK to modify it.");
+                    SettingsButton.PerformClick();
+                    return;
+                }
+
+                if (PortHelper.PortInUse(Global.Settings.HTTPLocalPort))
+                {
+                    MessageBoxX.Show("The HTTP port is in use. Click OK to modify it.");
+                    SettingsButton.PerformClick();
+                    return;
+                }
+
+                if (PortHelper.PortInUse(Global.Settings.RedirectorTCPPort, PortType.TCP))
+                {
+                    MessageBoxX.Show("The RedirectorTCP port is in use. Click OK to modify it.");
+                    SettingsButton.PerformClick();
+                    return;
+                }
+                #endregion
 
                 UpdateStatus(State.Starting);
 
diff --git a/Netch/Forms/SettingForm.cs b/Netch/Forms/SettingForm.cs
index 99aad7dd..fcd5a85a 100644
--- a/Netch/Forms/SettingForm.cs
+++ b/Netch/Forms/SettingForm.cs
@@ -398,6 +398,26 @@ namespace Netch.Forms
             Global.Settings.TUNTAP.ProxyDNS = ProxyDNSCheckBox.Checked;
             Global.Settings.TUNTAP.UseFakeDNS = UseFakeDNSCheckBox.Checked;
 
+            #region 检查端口是否被占用
+            if (PortHelper.PortInUse(Global.Settings.Socks5LocalPort))
+            {
+                MessageBoxX.Show("The Socks5 port is in use. Please reset.");
+                return;
+            }
+
+            if (PortHelper.PortInUse(Global.Settings.HTTPLocalPort))
+            {
+                MessageBoxX.Show("The HTTP port is in use. Please reset.");
+                return;
+            }
+
+            if (PortHelper.PortInUse(Global.Settings.RedirectorTCPPort, PortType.TCP))
+            {
+                MessageBoxX.Show("The RedirectorTCP port is in use. Please reset.");
+                return;
+            }
+            #endregion
+
             Configuration.Save();
             MessageBoxX.Show(i18N.Translate("Saved"));
             Close();
diff --git a/Netch/Resources/zh-CN b/Netch/Resources/zh-CN
index 79be3937..7627f31f 100644
--- a/Netch/Resources/zh-CN
+++ b/Netch/Resources/zh-CN
@@ -187,6 +187,13 @@
     "Exit": "退出",
     "Unable to start? Click me to download": "无法启动？点我下载依赖",
 
+    "The Socks5 port is in use. Click OK to modify it.": "Socks5端口已被占用，点击确定前往修改",
+    "The Socks5 port is in use. Please reset.": "Socks5端口已被占用，请重新设置",
+    "The HTTP port is in use. Click OK to modify it.": "HTTP端口已被占用，点击确定前往修改",
+    "The HTTP port is in use. Please reset.": "HTTP端口已被占用，请重新设置",
+    "The RedirectorTCP port is in use. Click OK to modify it.": "RedirectorTCP端口已被占用，点击确定前往修改",
+    "The RedirectorTCP port is in use. Please reset.": "RedirectorTCP端口已被占用，请重新设置",
+
     "Bypass LAN": "[网页代理] 绕过局域网",
     "Bypass LAN (Non System Proxy)": "[网页代理] 绕过局域网（不设置系统代理）",
     "Bypass LAN (TUN/TAP)": "[TUN/TAP] 绕过局域网",
diff --git a/Netch/Utils/PortHelper.cs b/Netch/Utils/PortHelper.cs
new file mode 100644
index 00000000..8c57d370
--- /dev/null
+++ b/Netch/Utils/PortHelper.cs
@@ -0,0 +1,59 @@
+using System.Net;
+using System.Net.NetworkInformation;
+
+namespace Netch.Utils
+{
+    class PortHelper
+    {
+        /// <summary>
+        /// 端口是否被使用
+        /// </summary>
+        /// <param name="port"></param>
+        /// <returns></returns>
+        public static bool PortInUse(int port)
+        {
+            return PortInUse(port, PortType.TCP) || PortInUse(port, PortType.UDP);
+        }
+
+        /// <summary>
+        /// 指定类型的端口是否已经被使用了
+        /// </summary>
+        /// <param name="port">端口号</param>
+        /// <param name="type">端口类型</param>
+        /// <returns></returns>
+        public static bool PortInUse(int port, PortType type)
+        {
+            bool flag = false;
+            IPGlobalProperties properties = IPGlobalProperties.GetIPGlobalProperties();
+            IPEndPoint[] ipendpoints = null;
+            if (type == PortType.TCP)
+            {
+                ipendpoints = properties.GetActiveTcpListeners();
+            }
+            else
+            {
+                ipendpoints = properties.GetActiveUdpListeners();
+            }
+            foreach (IPEndPoint ipendpoint in ipendpoints)
+            {
+                if (ipendpoint.Port == port)
+                {
+                    flag = true;
+                    break;
+                }
+            }
+            ipendpoints = null;
+            properties = null;
+            return flag;
+        }
+    }
+
+    /// <summary>
+    /// 端口类型
+    /// </summary>
+    enum PortType
+    {
+        TCP,
+        UDP
+    }
+}
\ No newline at end of file