diff --git a/Netch/Forms/MainForm.cs b/Netch/Forms/MainForm.cs
index 6d51f661..2536bf30 100644
--- a/Netch/Forms/MainForm.cs
+++ b/Netch/Forms/MainForm.cs
@@ -629,10 +629,12 @@ namespace Netch.Forms
 
         private void SettingsButton_Click(object sender, EventArgs e)
         {
+            var oldSettings = Global.Settings.Clone();
+
             Hide();
             new SettingForm().ShowDialog();
 
-            if (i18N.LangCode != Global.Settings.Language)
+            if (oldSettings.Language != Global.Settings.Language)
             {
                 i18N.Load(Global.Settings.Language);
                 InitText();
@@ -640,10 +642,10 @@ namespace Netch.Forms
                 InitProfile();
             }
 
-            if (ServerHelper.DelayTestHelper.Interval != Global.Settings.DetectionTick)
+            if (oldSettings.DetectionTick != Global.Settings.DetectionTick)
                 ServerHelper.DelayTestHelper.UpdateInterval();
 
-            if (ProfileButtons.Count != Global.Settings.ProfileCount)
+            if (oldSettings.ProfileCount != Global.Settings.ProfileCount)
                 InitProfile();
 
             Show();
diff --git a/Netch/Forms/SettingForm.cs b/Netch/Forms/SettingForm.cs
index 929210bb..2006f380 100644
--- a/Netch/Forms/SettingForm.cs
+++ b/Netch/Forms/SettingForm.cs
@@ -73,7 +73,7 @@ namespace Netch.Forms
                 i => Global.Settings.ProfileCount = i,
                 Global.Settings.ProfileCount);
             BindTextBox<int>(DetectionTickTextBox,
-                i => i >= 0,
+                i => ServerHelper.DelayTestHelper.Range.InRange(i),
                 i => Global.Settings.DetectionTick = i,
                 Global.Settings.DetectionTick);
             BindTextBox<int>(StartedPingIntervalTextBox,
diff --git a/Netch/Models/Range.cs b/Netch/Models/Range.cs
new file mode 100644
index 00000000..1fdaa3b3
--- /dev/null
+++ b/Netch/Models/Range.cs
@@ -0,0 +1,20 @@
+namespace Netch.Models
+{
+    public readonly struct Range
+    {
+        public int Start { get; }
+
+        public int End { get; }
+
+        public Range(int start, int end)
+        {
+            Start = start;
+            End = end;
+        }
+
+        public bool InRange(int num)
+        {
+            return Start <= num && num <= End;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Netch/Models/Setting.cs b/Netch/Models/Setting.cs
index cb252ef0..97cf3d24 100644
--- a/Netch/Models/Setting.cs
+++ b/Netch/Models/Setting.cs
@@ -286,5 +286,9 @@ namespace Netch.Models
         public bool UseProxyToUpdateSubscription = false;
 
         public V2rayConfig V2RayConfig = new();
+        public Setting Clone()
+        {
+            return (Setting) MemberwiseClone();
+        }
     }
 }
\ No newline at end of file
diff --git a/Netch/Utils/PortHelper.cs b/Netch/Utils/PortHelper.cs
index 37bd5637..442657c1 100644
--- a/Netch/Utils/PortHelper.cs
+++ b/Netch/Utils/PortHelper.cs
@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
 using System.Net.NetworkInformation;
+using Netch.Models;
 
 namespace Netch.Utils
 {
@@ -65,7 +66,6 @@ namespace Netch.Utils
                 }
         }
 
-
         /// <summary>
         ///     指定类型的端口是否已经被使用了
         /// </summary>
@@ -151,24 +151,6 @@ namespace Netch.Utils
         }
     }
 
-    internal readonly struct Range
-    {
-        public int Start { get; }
-
-        public int End { get; }
-
-        public Range(int start, int end)
-        {
-            Start = start;
-            End = end;
-        }
-
-        public bool InRange(int num)
-        {
-            return Start <= num && num <= End;
-        }
-    }
-
     /// <summary>
     ///     检查端口类型
     /// </summary>
diff --git a/Netch/Utils/ServerHelper.cs b/Netch/Utils/ServerHelper.cs
index 57e3f3bc..fbedd760 100644
--- a/Netch/Utils/ServerHelper.cs
+++ b/Netch/Utils/ServerHelper.cs
@@ -23,13 +23,14 @@ namespace Netch.Utils
         {
             private static readonly Timer Timer;
             private static bool _mux;
+
+            public static readonly Range Range = new(0, int.MaxValue / 1000);
             static DelayTestHelper()
             {
                 Timer = new Timer
                 {
                     Interval = 10000,
-                    AutoReset = true,
-                    Enabled = false
+                    AutoReset = true
                 };
 
                 Timer.Elapsed += (_, _) => TestAllDelay();
@@ -64,17 +65,14 @@ namespace Netch.Utils
 
             public static void UpdateInterval()
             {
-                var enabled = Enabled;
                 Timer.Stop();
-                if (Global.Settings.DetectionTick <= 0)
+
+                if (Global.Settings.DetectionTick == 0 || !Range.InRange(Global.Settings.DetectionTick))
                     return;
 
                 Timer.Interval = Global.Settings.DetectionTick * 1000;
-                if (enabled)
-                {
-                    Task.Run(TestAllDelay);
-                    Timer.Start();
-                }
+                Task.Run(TestAllDelay);
+                Timer.Start();
             }
         }