diff --git a/src/Snap.Hutao/Snap.Hutao/Web/ApiEndpoints.cs b/src/Snap.Hutao/Snap.Hutao/Web/ApiEndpoints.cs
index cb9986a8..c3b863db 100644
--- a/src/Snap.Hutao/Snap.Hutao/Web/ApiEndpoints.cs
+++ b/src/Snap.Hutao/Snap.Hutao/Web/ApiEndpoints.cs
@@ -281,7 +281,10 @@ internal static class ApiEndpoints
     /// <summary>
     /// 公告列表
     /// </summary>
-    public static string AnnList(string languageCode, string region)
+    /// <param name="languageCode">语言代码</param>
+    /// <param name="region">服务器</param>
+    /// <returns>公告列表Url</returns>
+    public static string AnnList(string languageCode, in Region region)
     {
         return $"{Hk4eApiAnnouncementApi}/getAnnList?{AnnouncementQuery(languageCode, region)}";
     }
@@ -289,7 +292,10 @@ internal static class ApiEndpoints
     /// <summary>
     /// 公告内容
     /// </summary>
-    public static string AnnContent(string languageCode, string region)
+    /// <param name="languageCode">语言代码</param>
+    /// <param name="region">服务器</param>
+    /// <returns>公告列表Url</returns>
+    public static string AnnContent(string languageCode, in Region region)
     {
         return $"{Hk4eApiAnnouncementApi}/getAnnContent?{AnnouncementQuery(languageCode, region)}";
     }
@@ -428,7 +434,7 @@ internal static class ApiEndpoints
     /// </summary>
     public const string WebStaticMihoyoReferer = "https://webstatic.mihoyo.com";
 
-    private static string AnnouncementQuery(string languageCode, string region)
+    private static string AnnouncementQuery(string languageCode, in Region region)
     {
         return $"game=hk4e&game_biz=hk4e_cn&lang={languageCode}&bundle_id=hk4e_cn&platform=pc&region={region}&level=55&uid=100000000";
     }
diff --git a/src/Snap.Hutao/Snap.Hutao/Web/ApiOsEndpoints.cs b/src/Snap.Hutao/Snap.Hutao/Web/ApiOsEndpoints.cs
index d1205ff4..eb17d057 100644
--- a/src/Snap.Hutao/Snap.Hutao/Web/ApiOsEndpoints.cs
+++ b/src/Snap.Hutao/Snap.Hutao/Web/ApiOsEndpoints.cs
@@ -100,7 +100,7 @@ internal static class ApiOsEndpoints
     /// </summary>
     /// <param name="region">地区代号</param>
     /// <returns>用户游戏角色字符串</returns>
-    public static string UserGameRolesByLtoken(string region)
+    public static string UserGameRolesByLtoken(in Region region)
     {
         return $"{ApiAccountOsBindingApi}/getUserGameRolesByLtoken?game_biz=hk4e_global&region={region}";
     }
@@ -197,7 +197,7 @@ internal static class ApiOsEndpoints
     /// <param name="languageCode">语言代码</param>
     /// <param name="region">服务器</param>
     /// <returns>公告列表Url</returns>
-    public static string AnnList(string languageCode, string region)
+    public static string AnnList(string languageCode, in Region region)
     {
         return $"{Hk4eApiOsAnnouncementApi}/getAnnList?{AnnouncementQuery(languageCode, region)}";
     }
@@ -208,7 +208,7 @@ internal static class ApiOsEndpoints
     /// <param name="languageCode">语言代码</param>
     /// <param name="region">服务器</param>
     /// <returns>公告内容Url</returns>
-    public static string AnnContent(string languageCode, string region)
+    public static string AnnContent(string languageCode, in Region region)
     {
         return $"{Hk4eApiOsAnnouncementApi}/getAnnContent?{AnnouncementQuery(languageCode, region)}";
     }
@@ -360,7 +360,7 @@ internal static class ApiOsEndpoints
     /// </summary>
     public const string AppHoyolabReferer = "https://app.hoyolab.com/";
 
-    private static string AnnouncementQuery(string languageCode, string region)
+    private static string AnnouncementQuery(string languageCode, in Region region)
     {
         return $"game=hk4e&game_biz=hk4e_global&lang={languageCode}&bundle_id=hk4e_global&platform=pc&region={region}&level=55&uid=100000000";
     }
diff --git a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Hk4e/Event/GachaInfo/GachaLogPage.cs b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Hk4e/Event/GachaInfo/GachaLogPage.cs
index e4a6dc7f..1dd4da2a 100644
--- a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Hk4e/Event/GachaInfo/GachaLogPage.cs
+++ b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Hk4e/Event/GachaInfo/GachaLogPage.cs
@@ -41,7 +41,8 @@ internal sealed class GachaLogPage : IJsonOnDeserialized
     /// 地区
     /// </summary>
     [JsonPropertyName("region")]
-    public string Region { get; set; } = default!;
+    [JsonConverter(typeof(RegionConverter))]
+    public Region Region { get; set; } = default!;
 
     public void OnDeserialized()
     {
diff --git a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/PlayerUid.cs b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/PlayerUid.cs
index a788a6cd..c1fa8b94 100644
--- a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/PlayerUid.cs
+++ b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/PlayerUid.cs
@@ -17,18 +17,18 @@ internal readonly partial struct PlayerUid
     /// <summary>
     /// 地区代码
     /// </summary>
-    public readonly string Region;
+    public readonly Region Region;
 
     /// <summary>
     /// 构造一个新的玩家 Uid 结构
     /// </summary>
     /// <param name="value">uid</param>
     /// <param name="region">服务器，当提供该参数时会无条件信任</param>
-    public PlayerUid(string value, string? region = default)
+    public PlayerUid(string value, in Region? region = default)
     {
         Must.Argument(HoyolabRegex.UidRegex().IsMatch(value), SH.WebHoyolabInvalidUid);
         Value = value;
-        Region = region ?? EvaluateRegion(value.AsSpan()[0]);
+        Region = region ?? Region.FromUid(value);
     }
 
     public static implicit operator PlayerUid(string source)
@@ -67,12 +67,12 @@ internal readonly partial struct PlayerUid
         };
     }
 
-    public static TimeSpan GetRegionTimeZoneUtcOffsetForRegion(string region)
+    public static TimeSpan GetRegionTimeZoneUtcOffsetForRegion(in Region region)
     {
         // 美服 UTC-05
         // 欧服 UTC+01
         // 其他 UTC+08
-        return region switch
+        return region.Value switch
         {
             "os_usa" => ServerRegionTimeZone.AmericaServerOffset,
             "os_euro" => ServerRegionTimeZone.EuropeServerOffset,
@@ -85,21 +85,4 @@ internal readonly partial struct PlayerUid
     {
         return Value;
     }
-
-    private static string EvaluateRegion(in char first)
-    {
-        return first switch
-        {
-            // CN
-            >= '1' and <= '4' => "cn_gf01", // 国服
-            '5' => "cn_qd01",               // 渠道
-
-            // OS
-            '6' => "os_usa",                // 美服
-            '7' => "os_euro",               // 欧服
-            '8' => "os_asia",               // 亚服
-            '9' => "os_cht",                // 台服
-            _ => throw Must.NeverHappen(),
-        };
-    }
 }
\ No newline at end of file
diff --git a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/PlayerUidExtension.cs b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/PlayerUidExtension.cs
index 538827a8..411d39e2 100644
--- a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/PlayerUidExtension.cs
+++ b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/PlayerUidExtension.cs
@@ -12,7 +12,7 @@ internal static class PlayerUidExtension
     {
         NameValueCollection collection = [];
         collection.Set("role_id", playerUid.Value);
-        collection.Set("server", playerUid.Region);
+        collection.Set("server", playerUid.Region.Value);
 
         return collection.ToQueryString();
     }
@@ -21,7 +21,7 @@ internal static class PlayerUidExtension
     {
         NameValueCollection collection = [];
         collection.Set("uid", playerUid.Value);
-        collection.Set("region", playerUid.Region);
+        collection.Set("region", playerUid.Region.Value);
 
         return collection.ToQueryString();
     }
diff --git a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/RegionConverter.cs b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/RegionConverter.cs
new file mode 100644
index 00000000..209ad3ac
--- /dev/null
+++ b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/RegionConverter.cs
@@ -0,0 +1,22 @@
+// Copyright (c) DGP Studio. All rights reserved.
+// Licensed under the MIT license.
+
+namespace Snap.Hutao.Web.Hoyolab;
+
+internal sealed class RegionConverter : JsonConverter<Region>
+{
+    public override Region Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        if (reader.GetString() is { } regionValue)
+        {
+            return Region.FromRegion(regionValue);
+        }
+
+        return default;
+    }
+
+    public override void Write(Utf8JsonWriter writer, Region value, JsonSerializerOptions options)
+    {
+        writer.WriteStringValue(value.ToString());
+    }
+}
diff --git a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/Binding/GenAuthKeyData.cs b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/Binding/GenAuthKeyData.cs
index 429049a6..de71b91f 100644
--- a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/Binding/GenAuthKeyData.cs
+++ b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/Binding/GenAuthKeyData.cs
@@ -25,7 +25,7 @@ internal sealed class GenAuthKeyData
         AuthAppId = authAppId;
         GameBiz = gameBiz;
         GameUid = int.Parse(uid.Value, CultureInfo.InvariantCulture);
-        Region = uid.Region;
+        Region = uid.Region.Value;
     }
 
     /// <summary>
@@ -50,7 +50,8 @@ internal sealed class GenAuthKeyData
     /// 区域
     /// </summary>
     [JsonPropertyName("region")]
-    public string Region { get; set; } = default!;
+    [JsonConverter(typeof(RegionConverter))]
+    public Region Region { get; set; } = default!;
 
     /// <summary>
     /// 创建为祈愿记录验证密钥提交数据
diff --git a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/Binding/UserGameRole.cs b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/Binding/UserGameRole.cs
index 2856598f..2e8ca931 100644
--- a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/Binding/UserGameRole.cs
+++ b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/Binding/UserGameRole.cs
@@ -19,7 +19,8 @@ internal sealed class UserGameRole
     /// 服务器
     /// </summary>
     [JsonPropertyName("region")]
-    public string Region { get; set; } = default!;
+    [JsonConverter(typeof(RegionConverter))]
+    public Region Region { get; set; } = default!;
 
     /// <summary>
     /// 游戏Uid
diff --git a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/Event/BbsSignReward/SignInData.cs b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/Event/BbsSignReward/SignInData.cs
index d3f5b4cd..275c7414 100644
--- a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/Event/BbsSignReward/SignInData.cs
+++ b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/Event/BbsSignReward/SignInData.cs
@@ -17,7 +17,7 @@ internal sealed class SignInData
     public SignInData(PlayerUid uid, bool isOversea)
     {
         ActivityId = isOversea ? ApiOsEndpoints.SignInRewardActivityId : ApiEndpoints.LunaActivityId;
-        Region = uid.Region;
+        Region = uid.Region.Value;
         Uid = uid.Value;
     }
 
@@ -31,7 +31,8 @@ internal sealed class SignInData
     /// 地区代码
     /// </summary>
     [JsonPropertyName("region")]
-    public string Region { get; }
+    [JsonConverter(typeof(RegionConverter))]
+    public Region Region { get; }
 
     /// <summary>
     /// Uid
diff --git a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/Event/Calculate/CalculateClient.cs b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/Event/Calculate/CalculateClient.cs
index 8d08d3be..fb1777fc 100644
--- a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/Event/Calculate/CalculateClient.cs
+++ b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/Event/Calculate/CalculateClient.cs
@@ -55,7 +55,7 @@ internal sealed partial class CalculateClient
     public async ValueTask<List<Avatar>> GetAvatarsAsync(UserAndUid userAndUid, CancellationToken token = default)
     {
         int currentPage = 1;
-        SyncAvatarFilter filter = new() { Uid = userAndUid.Uid.Value, Region = userAndUid.Uid.Region };
+        SyncAvatarFilter filter = new() { Uid = userAndUid.Uid.Value, Region = userAndUid.Uid.Region.Value };
 
         List<Avatar> avatars = [];
         Response<ListWrapper<Avatar>>? resp;
@@ -181,7 +181,8 @@ internal sealed partial class CalculateClient
         public string Uid { get; set; } = default!;
 
         [JsonPropertyName("region")]
-        public string Region { get; set; } = default!;
+        [JsonConverter(typeof(RegionConverter))]
+        public Region Region { get; set; } = default!;
     }
 
     private class IdCount
diff --git a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/GameRecord/Avatar/CharacterData.cs b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/GameRecord/Avatar/CharacterData.cs
index b60cef12..5bf07d7d 100644
--- a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/GameRecord/Avatar/CharacterData.cs
+++ b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/GameRecord/Avatar/CharacterData.cs
@@ -20,7 +20,7 @@ internal sealed class CharacterData
     {
         CharacterIds = characterIds;
         Uid = uid.Value;
-        Server = uid.Region;
+        Server = uid.Region.Value;
     }
 
     /// <summary>
diff --git a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/GameRecord/Avatar/Role.cs b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/GameRecord/Avatar/Role.cs
index 2c28e0a2..4adcbf77 100644
--- a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/GameRecord/Avatar/Role.cs
+++ b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/GameRecord/Avatar/Role.cs
@@ -25,7 +25,8 @@ internal sealed class Role
     /// 服务器
     /// </summary>
     [JsonPropertyName("region")]
-    public string Region { get; set; } = default!;
+    [JsonConverter(typeof(RegionConverter))]
+    public Region Region { get; set; } = default!;
 
     /// <summary>
     /// 等级
diff --git a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/GameRecord/BasicRoleInfo.cs b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/GameRecord/BasicRoleInfo.cs
index 311ee399..75980f1e 100644
--- a/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/GameRecord/BasicRoleInfo.cs
+++ b/src/Snap.Hutao/Snap.Hutao/Web/Hoyolab/Takumi/GameRecord/BasicRoleInfo.cs
@@ -26,7 +26,8 @@ internal sealed class BasicRoleInfo
     /// 区域代码
     /// </summary>
     [JsonPropertyName("region")]
-    public string Region { get; set; } = default!;
+    [JsonConverter(typeof(RegionConverter))]
+    public Region Region { get; set; } = default!;
 
     /// <summary>
     /// 等级