diff --git a/mirai-core-api/src/commonMain/kotlin/data/MemberInfo.kt b/mirai-core-api/src/commonMain/kotlin/data/MemberInfo.kt
index 59b72d2a4..6f36c121f 100644
--- a/mirai-core-api/src/commonMain/kotlin/data/MemberInfo.kt
+++ b/mirai-core-api/src/commonMain/kotlin/data/MemberInfo.kt
@@ -21,4 +21,6 @@ public interface MemberInfo : FriendInfo {
     public val specialTitle: String
 
     public val muteTimestamp: Int
+
+    public val anonymousId: String? get() = null
 }
\ No newline at end of file
diff --git a/mirai-core/src/commonMain/kotlin/contact/GroupImpl.kt b/mirai-core/src/commonMain/kotlin/contact/GroupImpl.kt
index f9b2f1c30..e18564be9 100644
--- a/mirai-core/src/commonMain/kotlin/contact/GroupImpl.kt
+++ b/mirai-core/src/commonMain/kotlin/contact/GroupImpl.kt
@@ -230,6 +230,12 @@ internal class GroupImpl(
     }
 
     override fun newMember(memberInfo: MemberInfo): Member {
+        memberInfo.anonymousId?.let { anId ->
+            return AnonymousMemberImpl(
+                this, this.coroutineContext,
+                memberInfo, anId
+            )
+        }
         return MemberImpl(
             Mirai._lowLevelNewFriend(bot, memberInfo) as FriendImpl,
             this,
@@ -238,7 +244,7 @@ internal class GroupImpl(
         )
     }
 
-    internal fun newAnonymous(name: String): Member = newMember(
+    internal fun newAnonymous(name: String, id: String): Member = newMember(
         object : MemberInfo {
             override val nameCard = name
             override val permission = MemberPermission.MEMBER
@@ -247,6 +253,7 @@ internal class GroupImpl(
             override val uin = 80000000L
             override val nick = name
             override val remark: String = "匿名"
+            override val anonymousId: String get() = id
         }
     )
 
diff --git a/mirai-core/src/commonMain/kotlin/message/incomingSourceImpl.kt b/mirai-core/src/commonMain/kotlin/message/incomingSourceImpl.kt
index d5bc1a881..1274fdf20 100644
--- a/mirai-core/src/commonMain/kotlin/message/incomingSourceImpl.kt
+++ b/mirai-core/src/commonMain/kotlin/message/incomingSourceImpl.kt
@@ -20,6 +20,7 @@ import net.mamoe.mirai.internal.network.protocol.data.proto.MsgComm
 import net.mamoe.mirai.internal.network.protocol.data.proto.SourceMsg
 import net.mamoe.mirai.internal.network.protocol.packet.EMPTY_BYTE_ARRAY
 import net.mamoe.mirai.internal.utils._miraiContentToString
+import net.mamoe.mirai.internal.utils.encodeToBase64
 import net.mamoe.mirai.internal.utils.encodeToString
 import net.mamoe.mirai.internal.utils.io.serialization.toByteArray
 import net.mamoe.mirai.message.data.Message
@@ -154,7 +155,7 @@ internal data class MessageSourceFromGroupImpl(
         ) as GroupImpl).run {
             get(msg.msgHead.fromUin)
                 ?: msg.msgBody.richText.elems.firstOrNull { it.anonGroupMsg != null }?.run {
-                    newAnonymous(anonGroupMsg!!.anonNick.encodeToString())
+                    newAnonymous(anonGroupMsg!!.anonNick.encodeToString(), anonGroupMsg.anonId.encodeToBase64())
                 }
                 ?: error("cannot find member for MessageSourceFromGroupImpl. msg=${msg._miraiContentToString()}")
         }
diff --git a/mirai-core/src/commonMain/kotlin/network/protocol/packet/chat/receive/OnlinePush.PbPushGroupMsg.kt b/mirai-core/src/commonMain/kotlin/network/protocol/packet/chat/receive/OnlinePush.PbPushGroupMsg.kt
index f7e8c5603..cc52c585d 100644
--- a/mirai-core/src/commonMain/kotlin/network/protocol/packet/chat/receive/OnlinePush.PbPushGroupMsg.kt
+++ b/mirai-core/src/commonMain/kotlin/network/protocol/packet/chat/receive/OnlinePush.PbPushGroupMsg.kt
@@ -29,6 +29,7 @@ import net.mamoe.mirai.internal.network.protocol.data.proto.MsgOnlinePush
 import net.mamoe.mirai.internal.network.protocol.data.proto.Oidb0x8fc
 import net.mamoe.mirai.internal.network.protocol.packet.IncomingPacketFactory
 import net.mamoe.mirai.internal.utils._miraiContentToString
+import net.mamoe.mirai.internal.utils.encodeToBase64
 import net.mamoe.mirai.internal.utils.encodeToString
 import net.mamoe.mirai.internal.utils.io.serialization.loadAs
 import net.mamoe.mirai.internal.utils.io.serialization.readProtoBuf
@@ -74,10 +75,10 @@ internal object OnlinePushPbPushGroupMsg : IncomingPacketFactory<Packet?>("Onlin
         val group =
             bot.getGroup(pbPushMsg.msg.msgHead.groupInfo!!.groupCode) as GroupImpl? ?: return null // 机器人还正在进群
         val sender = if (anonymous != null) {
-            group.newAnonymous(anonymous.anonNick.encodeToString())
+            group.newAnonymous(anonymous.anonNick.encodeToString(), anonymous.anonId.encodeToBase64())
         } else {
-            group[pbPushMsg.msg.msgHead.fromUin]
-        } as MemberImpl
+            group[pbPushMsg.msg.msgHead.fromUin] as MemberImpl
+        }
 
         val name = if (anonymous != null) {
             sender.nameCard
@@ -99,7 +100,7 @@ internal object OnlinePushPbPushGroupMsg : IncomingPacketFactory<Packet?>("Onlin
         val flags = extraInfo?.flags ?: 0
         return GroupMessageEvent(
             senderName = name.also {
-                if (it != sender.nameCard) {
+                if (sender is MemberImpl && it != sender.nameCard) {
                     val origin = sender._nameCard
                     sender._nameCard = name
                     MemberCardChangeEvent(origin, name, sender).broadcast()