diff --git a/src/SKIT.FlurlHttpClient.Wechat.Work/Extensions/WechatWorkClientExecuteCgibinIdConvertExtensions.cs b/src/SKIT.FlurlHttpClient.Wechat.Work/Extensions/WechatWorkClientExecuteCgibinIdConvertExtensions.cs
index 7527909a..522d6593 100644
--- a/src/SKIT.FlurlHttpClient.Wechat.Work/Extensions/WechatWorkClientExecuteCgibinIdConvertExtensions.cs
+++ b/src/SKIT.FlurlHttpClient.Wechat.Work/Extensions/WechatWorkClientExecuteCgibinIdConvertExtensions.cs
@@ -126,5 +126,74 @@ namespace SKIT.FlurlHttpClient.Wechat.Work
 
             return await client.SendFlurlRequestAsJsonAsync<Models.CgibinIdConvertConvertTempExternalUserIdResponse>(flurlReq, data: request, cancellationToken: cancellationToken).ConfigureAwait(false);
         }
+
+        /// <summary>
+        /// <para>异步调用 [POST] /cgi-bin/idconvert/apply_to_upgrade_chatid 接口。</para>
+        /// <para>
+        /// REF: <br/>
+        /// <![CDATA[ https://developer.work.weixin.qq.com/document/path/99601 ]]>
+        /// </para>
+        /// </summary>
+        /// <param name="client"></param>
+        /// <param name="request"></param>
+        /// <param name="cancellationToken"></param>
+        /// <returns></returns>
+        public static async Task<Models.CgibinIdConvertApplyToUpgradeChatIdResponse> ExecuteCgibinIdConvertApplyToUpgradeChatIdAsync(this WechatWorkClient client, Models.CgibinIdConvertApplyToUpgradeChatIdRequest request, CancellationToken cancellationToken = default)
+        {
+            if (client is null) throw new ArgumentNullException(nameof(client));
+            if (request is null) throw new ArgumentNullException(nameof(request));
+
+            IFlurlRequest flurlReq = client
+                .CreateFlurlRequest(request, HttpMethod.Post, "cgi-bin", "idconvert", "apply_to_upgrade_chatid")
+                .SetQueryParam("access_token", request.AccessToken);
+
+            return await client.SendFlurlRequestAsJsonAsync<Models.CgibinIdConvertApplyToUpgradeChatIdResponse>(flurlReq, data: request, cancellationToken: cancellationToken).ConfigureAwait(false);
+        }
+
+        /// <summary>
+        /// <para>异步调用 [POST] /cgi-bin/idconvert/chatid 接口。</para>
+        /// <para>
+        /// REF: <br/>
+        /// <![CDATA[ https://developer.work.weixin.qq.com/document/path/99601 ]]>
+        /// </para>
+        /// </summary>
+        /// <param name="client"></param>
+        /// <param name="request"></param>
+        /// <param name="cancellationToken"></param>
+        /// <returns></returns>
+        public static async Task<Models.CgibinIdConvertChatIdResponse> ExecuteCgibinIdConvertChatIdAsync(this WechatWorkClient client, Models.CgibinIdConvertChatIdRequest request, CancellationToken cancellationToken = default)
+        {
+            if (client is null) throw new ArgumentNullException(nameof(client));
+            if (request is null) throw new ArgumentNullException(nameof(request));
+
+            IFlurlRequest flurlReq = client
+                .CreateFlurlRequest(request, HttpMethod.Post, "cgi-bin", "idconvert", "chatid")
+                .SetQueryParam("access_token", request.AccessToken);
+
+            return await client.SendFlurlRequestAsJsonAsync<Models.CgibinIdConvertChatIdResponse>(flurlReq, data: request, cancellationToken: cancellationToken).ConfigureAwait(false);
+        }
+
+        /// <summary>
+        /// <para>异步调用 [POST] /cgi-bin/idconvert/upgrade_chatid_for_new_corp 接口。</para>
+        /// <para>
+        /// REF: <br/>
+        /// <![CDATA[ https://developer.work.weixin.qq.com/document/path/99601 ]]>
+        /// </para>
+        /// </summary>
+        /// <param name="client"></param>
+        /// <param name="request"></param>
+        /// <param name="cancellationToken"></param>
+        /// <returns></returns>
+        public static async Task<Models.CgibinIdConvertUpgradeChatIdForNewCorpResponse> ExecuteCgibinIdConvertUpgradeChatIdForNewCorpAsync(this WechatWorkClient client, Models.CgibinIdConvertUpgradeChatIdForNewCorpRequest request, CancellationToken cancellationToken = default)
+        {
+            if (client is null) throw new ArgumentNullException(nameof(client));
+            if (request is null) throw new ArgumentNullException(nameof(request));
+
+            IFlurlRequest flurlReq = client
+                .CreateFlurlRequest(request, HttpMethod.Post, "cgi-bin", "idconvert", "upgrade_chatid_for_new_corp")
+                .SetQueryParam("suite_access_token", request.AccessToken);
+
+            return await client.SendFlurlRequestAsJsonAsync<Models.CgibinIdConvertUpgradeChatIdForNewCorpResponse>(flurlReq, data: request, cancellationToken: cancellationToken).ConfigureAwait(false);
+        }
     }
 }
diff --git a/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertApplyToUpgradeChatIdRequest.cs b/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertApplyToUpgradeChatIdRequest.cs
new file mode 100644
index 00000000..40f9bb3a
--- /dev/null
+++ b/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertApplyToUpgradeChatIdRequest.cs
@@ -0,0 +1,15 @@
+namespace SKIT.FlurlHttpClient.Wechat.Work.Models
+{
+    /// <summary>
+    /// <para>表示 [POST] /cgi-bin/idconvert/apply_to_upgrade_chatid 接口的请求。</para>
+    /// </summary>
+    public class CgibinIdConvertApplyToUpgradeChatIdRequest : WechatWorkRequest
+    {
+        /// <summary>
+        /// 获取或设置完成升级的时间戳。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("upgrade_time")]
+        [System.Text.Json.Serialization.JsonPropertyName("upgrade_time")]
+        public long UpgradeTimestamp { get; set; }
+    }
+}
diff --git a/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertApplyToUpgradeChatIdResponse.cs b/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertApplyToUpgradeChatIdResponse.cs
new file mode 100644
index 00000000..1dccc2fb
--- /dev/null
+++ b/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertApplyToUpgradeChatIdResponse.cs
@@ -0,0 +1,9 @@
+namespace SKIT.FlurlHttpClient.Wechat.Work.Models
+{
+    /// <summary>
+    /// <para>表示 [POST] /cgi-bin/idconvert/apply_to_upgrade_chatid 接口的响应。</para>
+    /// </summary>
+    public class CgibinIdConvertApplyToUpgradeChatIdResponse : WechatWorkResponse
+    {
+    }
+}
diff --git a/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertChatIdRequest.cs b/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertChatIdRequest.cs
new file mode 100644
index 00000000..23921568
--- /dev/null
+++ b/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertChatIdRequest.cs
@@ -0,0 +1,17 @@
+using System.Collections.Generic;
+
+namespace SKIT.FlurlHttpClient.Wechat.Work.Models
+{
+    /// <summary>
+    /// <para>表示 [POST] /cgi-bin/idconvert/chatid 接口的请求。</para>
+    /// </summary>
+    public class CgibinIdConvertChatIdRequest : WechatWorkRequest
+    {
+        /// <summary>
+        /// 获取或设置群聊 ID 列表。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("chat_id_list")]
+        [System.Text.Json.Serialization.JsonPropertyName("chat_id_list")]
+        public IList<string> GroupChatIdList { get; set; } = new List<string>();
+    }
+}
diff --git a/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertChatIdResponse.cs b/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertChatIdResponse.cs
new file mode 100644
index 00000000..1475f2f9
--- /dev/null
+++ b/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertChatIdResponse.cs
@@ -0,0 +1,42 @@
+namespace SKIT.FlurlHttpClient.Wechat.Work.Models
+{
+    /// <summary>
+    /// <para>表示 [POST] /cgi-bin/idconvert/chatid 接口的响应。</para>
+    /// </summary>
+    public class CgibinIdConvertChatIdResponse : WechatWorkResponse
+    {
+        public static class Types
+        {
+            public class Result
+            {
+                /// <summary>
+                /// 获取或设置升级前的群聊 ID。
+                /// </summary>
+                [Newtonsoft.Json.JsonProperty("chat_id")]
+                [System.Text.Json.Serialization.JsonPropertyName("chat_id")]
+                public string GroupChatId { get; set; } = default!;
+
+                /// <summary>
+                /// 获取或设置升级后的群聊 ID。
+                /// </summary>
+                [Newtonsoft.Json.JsonProperty("new_chat_id")]
+                [System.Text.Json.Serialization.JsonPropertyName("new_chat_id")]
+                public string NewGroupChatId { get; set; } = default!;
+            }
+        }
+
+        /// <summary>
+        /// 获取或设置结果列表。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("items")]
+        [System.Text.Json.Serialization.JsonPropertyName("items")]
+        public Types.Result[] ResultList { get; set; } = default!;
+
+        /// <summary>
+        /// 获取或设置无效的群聊 ID 列表。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("invalid_chat_id_list")]
+        [System.Text.Json.Serialization.JsonPropertyName("invalid_chat_id_list")]
+        public string[]? InvalidGroupChatIdList { get; set; } = default!;
+    }
+}
diff --git a/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertUpgradeChatIdForNewCorpRequest.cs b/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertUpgradeChatIdForNewCorpRequest.cs
new file mode 100644
index 00000000..0d0fdf2f
--- /dev/null
+++ b/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertUpgradeChatIdForNewCorpRequest.cs
@@ -0,0 +1,9 @@
+namespace SKIT.FlurlHttpClient.Wechat.Work.Models
+{
+    /// <summary>
+    /// <para>表示 [POST] /cgi-bin/idconvert/upgrade_chatid_for_new_corp 接口的请求。</para>
+    /// </summary>
+    public class CgibinIdConvertUpgradeChatIdForNewCorpRequest : WechatWorkRequest
+    {
+    }
+}
diff --git a/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertUpgradeChatIdForNewCorpResponse.cs b/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertUpgradeChatIdForNewCorpResponse.cs
new file mode 100644
index 00000000..848d220f
--- /dev/null
+++ b/src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinIdConvert/CgibinIdConvertUpgradeChatIdForNewCorpResponse.cs
@@ -0,0 +1,9 @@
+namespace SKIT.FlurlHttpClient.Wechat.Work.Models
+{
+    /// <summary>
+    /// <para>表示 [POST] /cgi-bin/idconvert/upgrade_chatid_for_new_corp 接口的响应。</para>
+    /// </summary>
+    public class CgibinIdConvertUpgradeChatIdForNewCorpResponse : WechatWorkResponse
+    {
+    }
+}
diff --git a/test/SKIT.FlurlHttpClient.Wechat.Work.UnitTests/ModelSamples/CgibinIdConvert/CgibinIdConvertApplyToUpgradeChatIdRequest.json b/test/SKIT.FlurlHttpClient.Wechat.Work.UnitTests/ModelSamples/CgibinIdConvert/CgibinIdConvertApplyToUpgradeChatIdRequest.json
new file mode 100644
index 00000000..48b802c2
--- /dev/null
+++ b/test/SKIT.FlurlHttpClient.Wechat.Work.UnitTests/ModelSamples/CgibinIdConvert/CgibinIdConvertApplyToUpgradeChatIdRequest.json
@@ -0,0 +1,3 @@
+{
+    "upgrade_time": 1234567
+}
diff --git a/test/SKIT.FlurlHttpClient.Wechat.Work.UnitTests/ModelSamples/CgibinIdConvert/CgibinIdConvertChatIdRequest.json b/test/SKIT.FlurlHttpClient.Wechat.Work.UnitTests/ModelSamples/CgibinIdConvert/CgibinIdConvertChatIdRequest.json
new file mode 100644
index 00000000..db7415b9
--- /dev/null
+++ b/test/SKIT.FlurlHttpClient.Wechat.Work.UnitTests/ModelSamples/CgibinIdConvert/CgibinIdConvertChatIdRequest.json
@@ -0,0 +1,3 @@
+{
+    "chat_id_list": [ "xxxxxx", "yyyyyy", "zzzzzzz" ]
+}
diff --git a/test/SKIT.FlurlHttpClient.Wechat.Work.UnitTests/ModelSamples/CgibinIdConvert/CgibinIdConvertChatIdResponse.json b/test/SKIT.FlurlHttpClient.Wechat.Work.UnitTests/ModelSamples/CgibinIdConvert/CgibinIdConvertChatIdResponse.json
new file mode 100644
index 00000000..0a051309
--- /dev/null
+++ b/test/SKIT.FlurlHttpClient.Wechat.Work.UnitTests/ModelSamples/CgibinIdConvert/CgibinIdConvertChatIdResponse.json
@@ -0,0 +1,15 @@
+{
+    "errcode": 0,
+    "errmsg": "ok",
+    "items": [
+        {
+            "chat_id": "xxxxxx",
+            "new_chat_id": "XXXXXX"
+        },
+        {
+            "chat_id": "yyyyyy",
+            "new_chat_id": "yyyyyy"
+        }
+    ],
+    "invalid_chat_id_list": [ "zzzzzz" ]
+}