diff --git a/v2rayN/ServiceLib/Handler/ConfigHandler.cs b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
index 0262a2c2..84fc0fc4 100644
--- a/v2rayN/ServiceLib/Handler/ConfigHandler.cs
+++ b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
@@ -722,7 +722,7 @@ public static class ConfigHandler
             SalamanderPass = profileItem.GetProtocolExtra().SalamanderPass?.TrimEx(),
             UpMbps = profileItem.GetProtocolExtra().UpMbps is null or < 0 ? config.HysteriaItem.UpMbps : profileItem.GetProtocolExtra().UpMbps,
             DownMbps = profileItem.GetProtocolExtra().DownMbps is null or < 0 ? config.HysteriaItem.DownMbps : profileItem.GetProtocolExtra().DownMbps,
-            HopInterval = profileItem.GetProtocolExtra().HopInterval is null or <= 5 ? Global.Hysteria2DefaultHopInt : profileItem.GetProtocolExtra().HopInterval,
+            HopInterval = profileItem.GetProtocolExtra().HopInterval?.TrimEx(),
         });
 
         await AddServerCommon(config, profileItem, toFile);
diff --git a/v2rayN/ServiceLib/Manager/AppManager.cs b/v2rayN/ServiceLib/Manager/AppManager.cs
index e2a108f0..6c05f155 100644
--- a/v2rayN/ServiceLib/Manager/AppManager.cs
+++ b/v2rayN/ServiceLib/Manager/AppManager.cs
@@ -329,7 +329,7 @@ public sealed class AppManager
                                 Ports = item.Ports.NullIfEmpty(),
                                 UpMbps = _config.HysteriaItem.UpMbps,
                                 DownMbps = _config.HysteriaItem.DownMbps,
-                                HopInterval = _config.HysteriaItem.HopInterval
+                                HopInterval = _config.HysteriaItem.HopInterval.ToString(),
                             };
                             break;
                         case EConfigType.TUIC:
diff --git a/v2rayN/ServiceLib/Models/ProtocolExtraItem.cs b/v2rayN/ServiceLib/Models/ProtocolExtraItem.cs
index 09569537..4cb95c8b 100644
--- a/v2rayN/ServiceLib/Models/ProtocolExtraItem.cs
+++ b/v2rayN/ServiceLib/Models/ProtocolExtraItem.cs
@@ -30,7 +30,7 @@ public record ProtocolExtraItem
     public int? UpMbps { get; init; }
     public int? DownMbps { get; init; }
     public string? Ports { get; init; }
-    public int? HopInterval { get; init; }
+    public string? HopInterval { get; init; }
 
     // group profile
     public string? GroupType { get; init; }
diff --git a/v2rayN/ServiceLib/Models/V2rayConfig.cs b/v2rayN/ServiceLib/Models/V2rayConfig.cs
index c752168a..34456a8e 100644
--- a/v2rayN/ServiceLib/Models/V2rayConfig.cs
+++ b/v2rayN/ServiceLib/Models/V2rayConfig.cs
@@ -473,7 +473,7 @@ public class HysteriaSettings4Ray
 public class HysteriaUdpHop4Ray
 {
     public string? ports { get; set; }
-    public int? interval { get; set; }
+    public string? interval { get; set; }
 }
 
 public class FinalMask4Ray
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs
index ef4bbaec..b5988187 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs
@@ -166,9 +166,24 @@ public partial class CoreConfigSingboxService
                                     return port.Contains(':') ? port : $"{port}:{port}";
                                 })
                                 .ToList();
-                            outbound.hop_interval = protocolExtra?.HopInterval is { } hi and >= 5
-                                ? $"{hi}s"
-                                : _config.HysteriaItem.HopInterval >= 5 ? $"{_config.HysteriaItem.HopInterval}s" : $"{Global.Hysteria2DefaultHopInt}s";
+                            outbound.hop_interval = _config.HysteriaItem.HopInterval >= 5
+                                ? $"{_config.HysteriaItem.HopInterval}s"
+                                : $"{Global.Hysteria2DefaultHopInt}s";
+                            if (int.TryParse(protocolExtra.HopInterval, out var hiResult))
+                            {
+                                outbound.hop_interval = hiResult >= 5 ? $"{hiResult}s" : outbound.hop_interval;
+                            }
+                            else if (protocolExtra.HopInterval?.Contains('-') ?? false)
+                            {
+                                // may be a range like 5-10
+                                var parts = protocolExtra.HopInterval.Split('-');
+                                if (parts.Length == 2 && int.TryParse(parts[0], out var hiL) &&
+                                    int.TryParse(parts[0], out var hiH))
+                                {
+                                    var hi = (hiL + hiH) / 2;
+                                    outbound.hop_interval = hi >= 5 ? $"{hi}s" : outbound.hop_interval;
+                                }
+                            }
                         }
 
                         break;
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
index 71d27ea1..e409f806 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
@@ -518,9 +518,11 @@ public partial class CoreConfigV2rayService
                     int? downMbps = protocolExtra?.DownMbps is { } sd and >= 0
                         ? sd
                         : _config.HysteriaItem.UpMbps;
-                    var hopInterval = protocolExtra?.HopInterval is { } hi and >= 5
-                        ? hi
-                        : _config.HysteriaItem.HopInterval >= 5 ? _config.HysteriaItem.HopInterval : Global.Hysteria2DefaultHopInt;
+                    var hopInterval = !protocolExtra.HopInterval.IsNullOrEmpty()
+                        ? protocolExtra.HopInterval
+                        : (_config.HysteriaItem.HopInterval >= 5
+                            ? _config.HysteriaItem.HopInterval
+                            : Global.Hysteria2DefaultHopInt).ToString();
                     HysteriaUdpHop4Ray? udpHop = null;
                     if (!ports.IsNullOrEmpty() &&
                         (ports.Contains(':') || ports.Contains('-') || ports.Contains(',')))
diff --git a/v2rayN/ServiceLib/ViewModels/AddServerViewModel.cs b/v2rayN/ServiceLib/ViewModels/AddServerViewModel.cs
index 73915544..acaa5511 100644
--- a/v2rayN/ServiceLib/ViewModels/AddServerViewModel.cs
+++ b/v2rayN/ServiceLib/ViewModels/AddServerViewModel.cs
@@ -33,7 +33,7 @@ public class AddServerViewModel : MyReactiveObject
     public int DownMbps { get; set; }
 
     [Reactive]
-    public int HopInterval { get; set; }
+    public string HopInterval { get; set; }
 
     [Reactive]
     public string Flow { get; set; }
@@ -115,7 +115,7 @@ public class AddServerViewModel : MyReactiveObject
         SalamanderPass = protocolExtra?.SalamanderPass ?? string.Empty;
         UpMbps = protocolExtra?.UpMbps ?? _config.HysteriaItem.UpMbps;
         DownMbps = protocolExtra?.DownMbps ?? _config.HysteriaItem.DownMbps;
-        HopInterval = protocolExtra?.HopInterval ?? Global.Hysteria2DefaultHopInt;
+        HopInterval = protocolExtra?.HopInterval.IsNullOrEmpty() ?? true ? Global.Hysteria2DefaultHopInt.ToString() : protocolExtra.HopInterval;
         VmessSecurity = protocolExtra?.VmessSecurity?.IsNullOrEmpty() == false ? protocolExtra.VmessSecurity : Global.DefaultSecurity;
         VlessEncryption = protocolExtra?.VlessEncryption.IsNullOrEmpty() == false ? protocolExtra.VlessEncryption : Global.None;
         SsMethod = protocolExtra?.SsMethod ?? string.Empty;
@@ -178,7 +178,7 @@ public class AddServerViewModel : MyReactiveObject
             SalamanderPass = SalamanderPass.NullIfEmpty(),
             UpMbps = UpMbps >= 0 ? UpMbps : null,
             DownMbps = DownMbps >= 0 ? DownMbps : null,
-            HopInterval = HopInterval >= 5 ? HopInterval : null,
+            HopInterval = HopInterval.NullIfEmpty(),
             VmessSecurity = VmessSecurity.NullIfEmpty(),
             VlessEncryption = VlessEncryption.NullIfEmpty(),
             SsMethod = SsMethod.NullIfEmpty(),