diff --git a/yunke-server/app/api/routers/groups.py b/yunke-server/app/api/routers/groups.py
index 0794290..077487f 100644
--- a/yunke-server/app/api/routers/groups.py
+++ b/yunke-server/app/api/routers/groups.py
@@ -102,18 +102,13 @@ async def list_groups(
     if conditions:
         list_stmt = list_stmt.where(*conditions)
     if (channel or "wechat") == "wechat":
-        # 云客「微信群统计」同款排序(2026-09-10 真机判别):员工分组——
-        # 按云客员工列表序(wechat_account.list_order,NULL 垫底按 wx_id)、
-        # 组内按 room_id(chatRoomId)字符串升序。WA 保持最近活跃优先。
+        # 云客「微信群统计」同款排序(2026-09-10 真机终判):owner_account_id
+        # (=微信号/wxid 混存,如 Nancyjade < csf7169708 < wxid_01gv…——大写
+        # 在小写前=区分大小写)**二进制字符串升序**分组,组内 room_id 字符串
+        # 升序。COLLATE BINARY 双库通用(MySQL/SQLite)。WA 保持最近活跃优先。
         list_stmt = (
-            list_stmt.outerjoin(
-                WechatAccount,
-                WechatAccount.wx_id == ChatGroup.owner_account_id,
-            )
-            .order_by(
-                WechatAccount.list_order.is_(None),
-                WechatAccount.list_order.asc(),
-                ChatGroup.owner_account_id.asc(),
+            list_stmt.order_by(
+                ChatGroup.owner_account_id.collate("BINARY").asc(),
                 ChatGroup.room_id.asc(),
             )
             .limit(page_size)
diff --git a/yunke-server/tests/test_api_groups.py b/yunke-server/tests/test_api_groups.py
index 4522c12..cbcdfca 100644
--- a/yunke-server/tests/test_api_groups.py
+++ b/yunke-server/tests/test_api_groups.py
@@ -64,10 +64,9 @@ async def _seed(session: AsyncSession) -> None:
 
 
 async def test_default_list_returns_all_ordered_desc(make_client):
-    """No filters -> 3 groups;微信排序=员工分组(list_order NULL 按 owner asc)
-    +组内 room_id 字符串升序(云客群统计同款,2026-09-10)。
-    seed 无 wechat_account 行 → list_order 全 NULL → owner 字符串序:
-    wa_owner_1 < wx_owner_1 < wx_owner_2 → [wa_room_x, room_a, room_b]。
+    """No filters -> 3 groups;微信排序=owner 二进制字符串升序分组+room_id
+    升序(云客群统计同款,2026-09-10 终判:区分大小写,大写排小写前)。
+    owner 序:wa_owner_1 < wx_owner_1 < wx_owner_2 → [wa_room_x, room_a, room_b]。
     """
     client = await make_client(_seed)
     r = await client.get("/api/groups")