diff --git a/app/database/room.py b/app/database/room.py
index 368a04a..54497db 100644
--- a/app/database/room.py
+++ b/app/database/room.py
@@ -54,7 +54,7 @@ class RoomBase(SQLModel, UTCBaseModel):
     auto_skip: bool
     auto_start_duration: int
     status: RoomStatus
-    # TODO: channel_id
+    channel_id: int | None = None
 
 
 class Room(AsyncAttrs, RoomBase, table=True):
@@ -84,6 +84,7 @@ class RoomResp(RoomBase):
     current_playlist_item: PlaylistResp | None = None
     current_user_score: PlaylistAggregateScore | None = None
     recent_participants: list[UserResp] = Field(default_factory=list)
+    channel_id: int = 0
 
     @classmethod
     async def from_db(
@@ -93,7 +94,9 @@ class RoomResp(RoomBase):
         include: list[str] = [],
         user: User | None = None,
     ) -> "RoomResp":
-        resp = cls.model_validate(room.model_dump())
+        d = room.model_dump()
+        d["channel_id"] = d.get("channel_id", 0) or 0
+        resp = cls.model_validate(d)
 
         stats = RoomPlaylistItemStats(count_active=0, count_total=0)
         difficulty_range = RoomDifficultyRange(
@@ -158,6 +161,7 @@ class RoomResp(RoomBase):
             # duration = room.settings.duration,
             starts_at=server_room.start_at,
             participant_count=len(room.users),
+            channel_id=server_room.room.channel_id or 0,
         )
         return resp
 
diff --git a/app/models/multiplayer_hub.py b/app/models/multiplayer_hub.py
index 5f99136..9eec7b5 100644
--- a/app/models/multiplayer_hub.py
+++ b/app/models/multiplayer_hub.py
@@ -44,6 +44,7 @@ from sqlmodel import col
 from sqlmodel.ext.asyncio.session import AsyncSession
 
 if TYPE_CHECKING:
+    from app.database.room import Room
     from app.signalr.hub import MultiplayerHub
 
 HOST_LIMIT = 50
@@ -348,7 +349,7 @@ class MultiplayerRoom(BaseModel):
     channel_id: int
 
     @classmethod
-    def from_db(cls, room) -> "MultiplayerRoom":
+    def from_db(cls, room: "Room") -> "MultiplayerRoom":
         """
         将 Room (数据库模型) 转换为 MultiplayerRoom (业务模型)
         """
@@ -358,7 +359,7 @@ class MultiplayerRoom(BaseModel):
         host_user = MultiplayerRoomUser(user_id=room.host_id)
         # playlist 转换
         playlist = []
-        if hasattr(room, "playlist"):
+        if room.playlist:
             for item in room.playlist:
                 playlist.append(
                     PlaylistItem(
@@ -396,7 +397,7 @@ class MultiplayerRoom(BaseModel):
             match_state=None,
             playlist=playlist,
             active_countdowns=[],
-            channel_id=getattr(room, "channel_id", 0),
+            channel_id=room.channel_id,
         )
 
 
diff --git a/app/router/chat/server.py b/app/router/chat/server.py
index 2c91952..6add821 100644
--- a/app/router/chat/server.py
+++ b/app/router/chat/server.py
@@ -4,10 +4,16 @@ import asyncio
 
 from app.database.chat import ChannelType, ChatChannel, ChatChannelResp, ChatMessageResp
 from app.database.lazer_user import User
-from app.dependencies.database import DBFactory, get_db_factory, get_redis
+from app.dependencies.database import (
+    DBFactory,
+    engine,
+    get_db_factory,
+    get_redis,
+)
 from app.dependencies.user import get_current_user
 from app.log import logger
 from app.models.chat import ChatEvent
+from app.service.subscribers.chat import ChatSubscriber
 
 from fastapi import APIRouter, Depends, Header, WebSocket, WebSocketDisconnect
 from fastapi.security import SecurityScopes
@@ -23,6 +29,9 @@ class ChatServer:
         self.redis: Redis = get_redis()
 
         self.tasks: set[asyncio.Task] = set()
+        self.ChatSubscriber = ChatSubscriber()
+        self.ChatSubscriber.chat_server = self
+        self._subscribed = False
 
     def _add_task(self, task):
         task = asyncio.create_task(task)
@@ -158,7 +167,13 @@ class ChatServer:
             del self.channels[channel_id]
 
         channel_resp = await ChatChannelResp.from_db(
-            channel, session, user, self.redis, self.channels[channel_id]
+            channel,
+            session,
+            user,
+            self.redis,
+            self.channels.get(channel_id)
+            if channel.type != ChannelType.PUBLIC
+            else None,
         )
         client = self.connect_client.get(user_id)
         if client:
@@ -170,6 +185,30 @@ class ChatServer:
                 ),
             )
 
+    async def join_room_channel(self, channel_id: int, user_id: int):
+        async with AsyncSession(engine) as session:
+            channel = await ChatChannel.get(channel_id, session)
+            if channel is None:
+                return
+
+            user = await session.get(User, user_id)
+            if user is None:
+                return
+
+            await self.join_channel(user, channel, session)
+
+    async def leave_room_channel(self, channel_id: int, user_id: int):
+        async with AsyncSession(engine) as session:
+            channel = await ChatChannel.get(channel_id, session)
+            if channel is None:
+                return
+
+            user = await session.get(User, user_id)
+            if user is None:
+                return
+
+            await self.leave_channel(user, channel, session)
+
 
 server = ChatServer()
 
@@ -207,6 +246,10 @@ async def chat_websocket(
     authorization: str = Header(...),
     factory: DBFactory = Depends(get_db_factory),
 ):
+    if not server._subscribed:
+        server._subscribed = True
+        await server.ChatSubscriber.start_subscribe()
+
     async for session in factory():
         token = authorization[7:]
         if (
diff --git a/app/router/v2/room.py b/app/router/v2/room.py
index ff62b4c..9a66e8a 100644
--- a/app/router/v2/room.py
+++ b/app/router/v2/room.py
@@ -116,7 +116,7 @@ class APICreatedRoom(RoomResp):
 
 
 async def _participate_room(
-    room_id: int, user_id: int, db_room: Room, session: AsyncSession
+    room_id: int, user_id: int, db_room: Room, session: AsyncSession, redis: Redis
 ):
     participated_user = (
         await session.exec(
@@ -138,6 +138,8 @@ async def _participate_room(
         participated_user.joined_at = datetime.now(UTC)
     db_room.participant_count += 1
 
+    await redis.publish("chat:room:joined", f"{db_room.channel_id}:{user_id}")
+
 
 @router.post(
     "/rooms",
@@ -150,11 +152,12 @@ async def create_room(
     room: APIUploadedRoom,
     db: AsyncSession = Depends(get_db),
     current_user: User = Security(get_client_user),
+    redis: Redis = Depends(get_redis),
 ):
     assert current_user.id is not None
     user_id = current_user.id
     db_room = await create_playlist_room_from_api(db, room, user_id)
-    await _participate_room(db_room.id, user_id, db_room, db)
+    await _participate_room(db_room.id, user_id, db_room, db, redis)
     created_room = APICreatedRoom.model_validate(await RoomResp.from_db(db_room, db))
     created_room.error = ""
     return created_room
@@ -219,11 +222,12 @@ async def add_user_to_room(
     room_id: int = Path(..., description="房间 ID"),
     user_id: int = Path(..., description="用户 ID"),
     db: AsyncSession = Depends(get_db),
+    redis: Redis = Depends(get_redis),
     current_user: User = Security(get_client_user),
 ):
     db_room = (await db.exec(select(Room).where(Room.id == room_id))).first()
     if db_room is not None:
-        await _participate_room(room_id, user_id, db_room, db)
+        await _participate_room(room_id, user_id, db_room, db, redis)
         await db.commit()
         await db.refresh(db_room)
         resp = await RoomResp.from_db(db_room, db)
@@ -243,6 +247,7 @@ async def remove_user_from_room(
     user_id: int = Path(..., description="用户 ID"),
     db: AsyncSession = Depends(get_db),
     current_user: User = Security(get_client_user),
+    redis: Redis = Depends(get_redis),
 ):
     db_room = (await db.exec(select(Room).where(Room.id == room_id))).first()
     if db_room is not None:
@@ -257,6 +262,7 @@ async def remove_user_from_room(
         if participated_user is not None:
             participated_user.left_at = datetime.now(UTC)
         db_room.participant_count -= 1
+        await redis.publish("chat:room:left", f"{db_room.channel_id}:{user_id}")
         await db.commit()
         return None
     else:
diff --git a/app/service/room.py b/app/service/room.py
index d11dced..d6fdcc6 100644
--- a/app/service/room.py
+++ b/app/service/room.py
@@ -3,6 +3,7 @@ from __future__ import annotations
 from datetime import UTC, datetime, timedelta
 
 from app.database.beatmap import Beatmap
+from app.database.chat import ChannelType, ChatChannel
 from app.database.playlists import Playlist
 from app.database.room import APIUploadedRoom, Room
 from app.dependencies.fetcher import get_fetcher
@@ -25,6 +26,18 @@ async def create_playlist_room_from_api(
     session.add(db_room)
     await session.commit()
     await session.refresh(db_room)
+
+    channel = ChatChannel(
+        name=f"room_{db_room.id}",
+        description="Playlist room",
+        type=ChannelType.MULTIPLAYER,
+    )
+    session.add(channel)
+    await session.commit()
+    await session.refresh(channel)
+    await session.refresh(db_room)
+    db_room.channel_id = channel.channel_id
+
     await add_playlists_to_room(session, db_room.id, room.playlist, host_id)
     await session.refresh(db_room)
     return db_room
@@ -57,6 +70,18 @@ async def create_playlist_room(
     session.add(db_room)
     await session.commit()
     await session.refresh(db_room)
+
+    channel = ChatChannel(
+        name=f"room_{db_room.id}",
+        description="Playlist room",
+        type=ChannelType.MULTIPLAYER,
+    )
+    session.add(channel)
+    await session.commit()
+    await session.refresh(channel)
+    await session.refresh(db_room)
+    db_room.channel_id = channel.channel_id
+
     await add_playlists_to_room(session, db_room.id, playlist, host_id)
     await session.refresh(db_room)
     return db_room
diff --git a/app/service/subscribers/base.py b/app/service/subscribers/base.py
index 8fc5654..693d4d8 100644
--- a/app/service/subscribers/base.py
+++ b/app/service/subscribers/base.py
@@ -24,6 +24,11 @@ class RedisSubscriber:
             del self.handlers[channel]
         await self.pubsub.unsubscribe(channel)
 
+    def add_handler(self, channel: str, handler: Callable[[str, str], Awaitable[Any]]):
+        if channel not in self.handlers:
+            self.handlers[channel] = []
+        self.handlers[channel].append(handler)
+
     async def listen(self):
         while True:
             message = await self.pubsub.get_message(
diff --git a/app/service/subscribers/chat.py b/app/service/subscribers/chat.py
new file mode 100644
index 0000000..0c61c06
--- /dev/null
+++ b/app/service/subscribers/chat.py
@@ -0,0 +1,38 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from .base import RedisSubscriber
+
+if TYPE_CHECKING:
+    from app.router.chat.server import ChatServer
+
+
+JOIN_CHANNEL = "chat:room:joined"
+EXIT_CHANNEL = "chat:room:left"
+
+
+class ChatSubscriber(RedisSubscriber):
+    def __init__(self):
+        super().__init__()
+        self.room_subscriber: dict[int, list[int]] = {}
+        self.chat_server: "ChatServer | None" = None
+
+    async def start_subscribe(self):
+        await self.subscribe(JOIN_CHANNEL)
+        self.add_handler(JOIN_CHANNEL, self.on_join_room)
+        await self.subscribe(EXIT_CHANNEL)
+        self.add_handler(EXIT_CHANNEL, self.on_leave_room)
+        self.start()
+
+    async def on_join_room(self, c: str, s: str):
+        channel_id, user_id = s.split(":")
+        if self.chat_server is None:
+            return
+        await self.chat_server.join_room_channel(int(channel_id), int(user_id))
+
+    async def on_leave_room(self, c: str, s: str):
+        channel_id, user_id = s.split(":")
+        if self.chat_server is None:
+            return
+        await self.chat_server.leave_room_channel(int(channel_id), int(user_id))
diff --git a/app/signalr/hub/multiplayer.py b/app/signalr/hub/multiplayer.py
index 4ada615..20eecf6 100644
--- a/app/signalr/hub/multiplayer.py
+++ b/app/signalr/hub/multiplayer.py
@@ -6,6 +6,7 @@ from typing import override
 
 from app.database import Room
 from app.database.beatmap import Beatmap
+from app.database.chat import ChannelType, ChatChannel
 from app.database.lazer_user import User
 from app.database.multiplayer_event import MultiplayerEvent
 from app.database.playlists import Playlist
@@ -195,6 +196,18 @@ class MultiplayerHub(Hub[MultiplayerClientState]):
                 await session.commit()
                 await session.refresh(db_room)
 
+                channel = ChatChannel(
+                    name=f"room_{db_room.id}",
+                    description="Multiplayer room",
+                    type=ChannelType.MULTIPLAYER,
+                )
+                session.add(channel)
+                await session.commit()
+                await session.refresh(channel)
+                await session.refresh(db_room)
+                room.channel_id = channel.channel_id  # pyright: ignore[reportAttributeAccessIssue]
+                db_room.channel_id = channel.channel_id
+
                 item = room.playlist[0]
                 item.owner_id = client.user_id
                 room.room_id = db_room.id
@@ -280,6 +293,10 @@ class MultiplayerHub(Hub[MultiplayerClientState]):
                 if db_room is None:
                     raise InvokeException("Room does not exist in database")
                 db_room.participant_count += 1
+
+        redis = get_redis()
+        await redis.publish("chat:room:joined", f"{room.channel_id}:{user.user_id}")
+
         return room
 
     async def change_beatmap_availability(
@@ -914,6 +931,9 @@ class MultiplayerHub(Hub[MultiplayerClientState]):
         if target_store:
             target_store.room_id = 0
 
+        redis = get_redis()
+        await redis.publish("chat:room:left", f"{room.room.channel_id}:{user.user_id}")
+
     async def end_room(self, room: ServerMultiplayerRoom):
         assert room.room.host
         async with AsyncSession(engine) as session:
diff --git a/migrations/versions/df9f725a077c_room_add_channel_id.py b/migrations/versions/df9f725a077c_room_add_channel_id.py
new file mode 100644
index 0000000..85e7d93
--- /dev/null
+++ b/migrations/versions/df9f725a077c_room_add_channel_id.py
@@ -0,0 +1,54 @@
+"""room: add channel_id
+
+Revision ID: df9f725a077c
+Revises: dd33d89aa2c2
+Create Date: 2025-08-16 08:05:28.748265
+
+"""
+
+from __future__ import annotations
+
+from collections.abc import Sequence
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import mysql
+
+# revision identifiers, used by Alembic.
+revision: str = "df9f725a077c"
+down_revision: str | Sequence[str] | None = "dd33d89aa2c2"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column(
+        "chat_silence_users", "user_id", existing_type=mysql.BIGINT(), nullable=True
+    )
+    op.alter_column(
+        "chat_silence_users", "banned_at", existing_type=mysql.DATETIME(), nullable=True
+    )
+    op.create_index(
+        op.f("ix_chat_silence_users_id"), "chat_silence_users", ["id"], unique=False
+    )
+    op.add_column("rooms", sa.Column("channel_id", sa.Integer(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column("rooms", "channel_id")
+    op.drop_index(op.f("ix_chat_silence_users_id"), table_name="chat_silence_users")
+    op.alter_column(
+        "chat_silence_users",
+        "banned_at",
+        existing_type=mysql.DATETIME(),
+        nullable=False,
+    )
+    op.alter_column(
+        "chat_silence_users", "user_id", existing_type=mysql.BIGINT(), nullable=False
+    )
+    # ### end Alembic commands ###