diff --git a/AquaMai/AquaMai.csproj b/AquaMai/AquaMai.csproj
index aecd3838..6e17f172 100644
--- a/AquaMai/AquaMai.csproj
+++ b/AquaMai/AquaMai.csproj
@@ -302,6 +302,7 @@
     <Compile Include="Performance\ImproveLoadSpeed.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Main.cs" />
+    <Compile Include="Utils\LogUserId.cs" />
     <Compile Include="UX\CustomPlaceName.cs" />
     <Compile Include="UX\CustomVersionString.cs" />
     <Compile Include="UX\DemoMaster.cs" />
diff --git a/AquaMai/AquaMai.toml b/AquaMai/AquaMai.toml
index aa756d4d..2b64e367 100644
--- a/AquaMai/AquaMai.toml
+++ b/AquaMai/AquaMai.toml
@@ -69,3 +69,7 @@ SkipVersionCheck=true
 RemoveEncryption=true
 ForceAsServer=true
 ForceFreePlay=true
+
+[Utils]
+# Log user ID on login
+LogUserId=false
diff --git a/AquaMai/AquaMai.zh.toml b/AquaMai/AquaMai.zh.toml
index b744b626..99ed18c2 100644
--- a/AquaMai/AquaMai.zh.toml
+++ b/AquaMai/AquaMai.zh.toml
@@ -85,3 +85,7 @@ RemoveEncryption=true
 # 如果要配置店内招募的话，应该要把这个关闭
 ForceAsServer=true
 ForceFreePlay=true
+
+[Utils]
+# 登录时将 UserID 输出到日志
+LogUserId=false
diff --git a/AquaMai/Config.cs b/AquaMai/Config.cs
index 00b4b561..790c57a2 100644
--- a/AquaMai/Config.cs
+++ b/AquaMai/Config.cs
@@ -10,6 +10,7 @@ namespace AquaMai
         public CheatConfig Cheat { get; set; }
         public PerformanceConfig Performance { get; set; }
         public FixConfig Fix { get; set; }
+        public UtilsConfig Utils { get; set; }
 
         public class CheatConfig
         {
@@ -55,5 +56,10 @@ namespace AquaMai
             public bool ForceAsServer { get; set; } = true;
             public bool ForceFreePlay { get; set; } = true;
         }
+
+        public class UtilsConfig
+        {
+            public bool LogUserId { get; set; }
+        }
     }
 }
diff --git a/AquaMai/Utils/LogUserId.cs b/AquaMai/Utils/LogUserId.cs
new file mode 100644
index 00000000..ef0ddf13
--- /dev/null
+++ b/AquaMai/Utils/LogUserId.cs
@@ -0,0 +1,18 @@
+using System;
+using HarmonyLib;
+using MelonLoader;
+using Net.Packet;
+using Net.Packet.Mai2;
+using Net.VO.Mai2;
+
+namespace AquaMai.Utils;
+
+public class LogUserId
+{
+    [HarmonyPostfix]
+    [HarmonyPatch(typeof(PacketGetUserPreview), MethodType.Constructor, typeof(ulong), typeof(string), typeof(Action<ulong, UserPreviewResponseVO>), typeof(Action<PacketStatus>))]
+    public static void Postfix(ulong userId)
+    {
+        MelonLogger.Msg($"UserLogin: {userId}");
+    }
+}