diff --git a/backend/app/api/integrations.py b/backend/app/api/integrations.py
index 728ab6d..c969227 100644
--- a/backend/app/api/integrations.py
+++ b/backend/app/api/integrations.py
@@ -66,7 +66,8 @@ def _channel_out(channel: BotChannel) -> dict[str, Any]:
         "name": channel.name,
         "status": channel.status,
         "connected": bool(channel.bot_token_enc) and channel.status == "active",
-        "polling": manager.running(channel.id),
+        # 只有抢到租约、真在拉消息的进程才算"接收中"；备用进程的任务在等键，不算。
+        "polling": manager.polling(channel.id),
         "ilink_user_id": channel.ilink_user_id,
         "last_seen_at": channel.last_seen_at,
         "last_error": channel.last_error,
diff --git a/backend/app/services/wechat_bot.py b/backend/app/services/wechat_bot.py
index cfa222a..5a15277 100644
--- a/backend/app/services/wechat_bot.py
+++ b/backend/app/services/wechat_bot.py
@@ -11,6 +11,9 @@
 3. **token 失效要停**：服务端 errcode `-14` 表示登录态作废，这时停轮询、把通道标记成
    需要重新扫码，别拿死 token 一直撞墙。
 4. **回复失败不影响已经落库的事项**：任务记下了就是记下了，回不回得去另说。
+5. **一个通道只能有一个进程在收**：生产是 gunicorn `-w 2`，两个进程各自跑 lifespan，
+   不加锁就会出现两条 getupdates 同时拉同一个会话——消息被其中一个消费、回复却从另一个发出，
+   游标还会互相覆盖。用 Postgres 的 advisory lock 做租约：抢到的那个进程收，另一个等着接班。
 """
 
 from __future__ import annotations
@@ -24,7 +27,7 @@ from sqlalchemy import select
 from sqlalchemy import text as sa_text
 
 from ..config import get_settings
-from ..db import SessionFactory, bind_tenant
+from ..db import SessionFactory, bind_tenant, engine
 from ..logging_setup import get_logger
 from ..models import Workspace
 from ..models_integrations import BotChannel, BotMessage
@@ -36,6 +39,9 @@ logger = get_logger("wechat_bot")
 # 长轮询一次最多等这么久（服务端 75 秒超时，客户端留点余量）。
 POLL_TIMEOUT_SECONDS = 80.0
 RETRY_DELAY_SECONDS = 5.0
+# 抢租约失败时隔多久再试：主进程挂了，备用进程要能在一两个呼吸之内接上。
+LEASE_RETRY_SECONDS = 10.0
+LEASE_NAMESPACE = "dadao.wechat_bot"
 
 
 def site_base() -> str:
@@ -48,11 +54,34 @@ def site_base() -> str:
     return ""
 
 
+async def acquire_lease(channel_id: uuid.UUID):
+    """抢"这个通道由我收消息"的租约；抢到返回连接（关掉就是释放），抢不到返回 None。
+
+    用会话级 advisory lock：锁挂在连接上，进程崩了连接断，锁自然释放，
+    不会留下"死进程占着锁没人收消息"的局面。
+    """
+    conn = await engine.connect()
+    try:
+        result = await conn.execute(
+            sa_text("SELECT pg_try_advisory_lock(hashtext(:ns), hashtext(:cid))"),
+            {"ns": LEASE_NAMESPACE, "cid": str(channel_id)},
+        )
+        if result.scalar():
+            return conn
+    except Exception:
+        await conn.close()
+        raise
+    await conn.close()
+    return None
+
+
 class BotManager:
     """一个进程里的轮询任务表：一个通道一个任务。"""
 
     def __init__(self) -> None:
         self._tasks: dict[uuid.UUID, asyncio.Task[None]] = {}
+        # 抢到租约、真正在拉消息的通道；备用进程的任务在等租约，不在这里。
+        self._polling: set[uuid.UUID] = set()
 
     # ── 生命周期 ──────────────────────────────────────────
 
@@ -95,6 +124,10 @@ class BotManager:
         task = self._tasks.get(channel_id)
         return task is not None and not task.done()
 
+    def polling(self, channel_id: uuid.UUID) -> bool:
+        """只有真在拉消息的那个进程才算，"页面上的接收中"认这个。"""
+        return channel_id in self._polling
+
     # ── 轮询主体 ──────────────────────────────────────────
 
     async def _load(self, channel_id: uuid.UUID) -> tuple[BotChannel, str] | None:
@@ -112,9 +145,29 @@ class BotManager:
             return channel, token
 
     async def _run(self, channel_id: uuid.UUID) -> None:
+        lease = await self._wait_for_lease(channel_id)
+        if lease is None:
+            self._tasks.pop(channel_id, None)
+            return
+        try:
+            await self._poll_forever(channel_id)
+        finally:
+            self._polling.discard(channel_id)
+            self._tasks.pop(channel_id, None)
+            await lease.close()
+
+    async def _wait_for_lease(self, channel_id: uuid.UUID):
+        """抢不到就等着——主进程一挂，最多 LEASE_RETRY_SECONDS 就由这里接上。"""
+        while True:
+            lease = await acquire_lease(channel_id)
+            if lease is not None:
+                self._polling.add(channel_id)
+                return lease
+            await asyncio.sleep(LEASE_RETRY_SECONDS)
+
+    async def _poll_forever(self, channel_id: uuid.UUID) -> None:
         loaded = await self._load(channel_id)
         if loaded is None:
-            self._tasks.pop(channel_id, None)
             return
         channel, token = loaded
         cursor = channel.sync_buf or ""
@@ -129,7 +182,6 @@ class BotManager:
             except wechat_ilink.WechatError as exc:
                 if exc.stale_token:
                     await self._mark_relogin(channel_id, str(exc))
-                    self._tasks.pop(channel_id, None)
                     return
                 failures += 1
                 await self._note_error(channel_id, str(exc))
diff --git a/backend/tests/test_wechat_bot.py b/backend/tests/test_wechat_bot.py
index e70f01a..a616a99 100644
--- a/backend/tests/test_wechat_bot.py
+++ b/backend/tests/test_wechat_bot.py
@@ -338,3 +338,19 @@ async def test_upstream_wait_status_is_normalized(monkeypatch: pytest.MonkeyPatc
     monkeypatch.setattr(wechat_ilink, "_post", fake_post)
     result = await wechat_ilink.qrcode_status("qr-x")
     assert result.status == "waiting"
+
+
+async def test_only_one_process_holds_the_polling_lease() -> None:
+    """生产是 gunicorn `-w 2`：同一个通道只能有一个进程在拉消息，另一个等着接班。"""
+    channel_id = uuid.uuid4()
+
+    first = await wechat_bot.acquire_lease(channel_id)
+    assert first is not None, "第一个进程该抢到"
+
+    second = await wechat_bot.acquire_lease(channel_id)
+    assert second is None, "第二个进程不该同时抢到，否则两条轮询会互相覆盖游标"
+
+    await first.close()  # 进程退出，连接断，锁释放
+    third = await wechat_bot.acquire_lease(channel_id)
+    assert third is not None, "前一个进程放手后，备用进程要能接上"
+    await third.close()