diff --git a/src/SKIT.FlurlHttpClient.Wechat.Work/Events/ExternalContact/ChangeExternalChatEvent.cs b/src/SKIT.FlurlHttpClient.Wechat.Work/Events/ExternalContact/ChangeExternalChatEvent.cs
index 2b353772..9ebaa6bb 100644
--- a/src/SKIT.FlurlHttpClient.Wechat.Work/Events/ExternalContact/ChangeExternalChatEvent.cs
+++ b/src/SKIT.FlurlHttpClient.Wechat.Work/Events/ExternalContact/ChangeExternalChatEvent.cs
@@ -7,6 +7,18 @@ namespace SKIT.FlurlHttpClient.Wechat.Work.Events
     /// </summary>
     public class ChangeExternalChatEvent : WechatWorkEvent, WechatWorkEvent.Serialization.IXmlSerializable
     {
+        public static class Types
+        {
+            public class MemberChangedList
+            {
+                /// <summary>
+                /// 获取或设置成员账号列表。
+                /// </summary>
+                [System.Xml.Serialization.XmlElement("Item")]
+                public string[] Items { get; set; } = default!;
+            }
+        }
+
         /// <summary>
         /// 获取或设置第三方应用的 SuiteId。
         /// </summary>
@@ -55,6 +67,12 @@ namespace SKIT.FlurlHttpClient.Wechat.Work.Events
         [System.Xml.Serialization.XmlElement("MemChangeCnt", IsNullable = true)]
         public int? MemberChangedCount { get; set; }
 
+        /// <summary>
+        /// 获取或设置成员变更列表。
+        /// </summary>
+        [System.Xml.Serialization.XmlElement("MemChangeList", IsNullable = true)]
+        public Types.MemberChangedList? MemberChangedList { get; set; }
+
         /// <summary>
         /// 获取或设置变更前的群成员版本号。
         /// </summary>
diff --git a/test/SKIT.FlurlHttpClient.Wechat.Work.UnitTests/EventSamples/ExternalContact/ChangeExternalChatEvent.Update.xml b/test/SKIT.FlurlHttpClient.Wechat.Work.UnitTests/EventSamples/ExternalContact/ChangeExternalChatEvent.Update.xml
index d738ce06..e2cbf785 100644
--- a/test/SKIT.FlurlHttpClient.Wechat.Work.UnitTests/EventSamples/ExternalContact/ChangeExternalChatEvent.Update.xml
+++ b/test/SKIT.FlurlHttpClient.Wechat.Work.UnitTests/EventSamples/ExternalContact/ChangeExternalChatEvent.Update.xml
@@ -1,4 +1,4 @@
-<xml>
+<xml>
     <SuiteId><![CDATA[ww4asffe99e54c0f4c]]></SuiteId>
     <AuthCorpId><![CDATA[wxf8b4f85f3a794e77]]></AuthCorpId>
     <InfoType><![CDATA[change_external_chat]]></InfoType>
@@ -9,4 +9,10 @@
     <JoinScene>1</JoinScene>
     <QuitScene>0</QuitScene>
     <MemChangeCnt>10</MemChangeCnt>
+    <MemChangeList>
+        <Item>Jack</Item>
+        <Item>Rose</Item>
+    </MemChangeList>
+    <LastMemVer>9c3f97c2ada667dfb5f6d03308d963e1</LastMemVer>
+    <CurMemVer>71217227bbd112ecfe3a49c482195cb4</CurMemVer>
 </xml>