diff --git a/scripts/data_platform/bs_5m_eod.py b/scripts/data_platform/bs_5m_eod.py
index fc45302..b7ce8e7 100644
--- a/scripts/data_platform/bs_5m_eod.py
+++ b/scripts/data_platform/bs_5m_eod.py
@@ -283,8 +283,10 @@ def _run(args):
             log.info("[CHUNK] %s~%s ok=%d empty=%d failed=%d rows=%d",
                      chunk[0], chunk[1], cs["ok"], cs["empty"], cs["failed"],
                      cs["db_rows"])
-            if not lr and swept[0] < DAILY_LIMIT:
-                # 整片扫完才推进 state; 没扫完次日重拉同片(OR REPLACE 幂等续跑)
+            if not lr and swept[0] < DAILY_LIMIT and not args.limit:
+                # 整片扫完才推进 state; 没扫完次日重拉同片(OR REPLACE 幂等续跑);
+                # --limit 冒烟只拉 N 只 ≠ 整片完成, 同禁推进(2026-08-22 冒烟
+                # 实锤多推一片跳过半年窗口)
                 save_chunk_state({"next_end": chunk[0]})
         # 每日增量照跑(回灌期也跑, 近端 7 天始终新鲜)
         istats, lr = _sweep(conn, stocks, inc_start, inc_end, swept, "inc")
diff --git a/tests/data_platform/test_bs_5m_eod.py b/tests/data_platform/test_bs_5m_eod.py
index 20f25a3..9190f49 100644
--- a/tests/data_platform/test_bs_5m_eod.py
+++ b/tests/data_platform/test_bs_5m_eod.py
@@ -218,6 +218,22 @@ def test_main_runs_and_exits_0(main_env):
     assert not (main_env / "bs_5m.lock").exists()
 
 
+def test_main_limit_smoke_never_advances_state(main_env, monkeypatch):
+    """--limit 冒烟只拉 N 只 ≠ 整片完成: 绝不推进 chunk state。
+
+    2026-08-22 09:17 独立容器冒烟(--limit 3)实锤把 state 多推一片
+    ([2025-02-18,2025-08-20] 半年片被 3 只股"代表"5548 只跳过): 根因
+    limit_reached 只盯 DAILY_LIMIT 配额防线, --limit 预截断后循环"正常
+    跑完" lr=False, 推进守卫畅通。"""
+    monkeypatch.setattr(sys, "argv", ["bs_5m_eod.py", "--limit", "1"])
+    with patch.object(b5, "_process_one", return_value=48) as m_proc:
+        with pytest.raises(SystemExit) as e:
+            b5.main()
+    assert e.value.code == 0
+    assert m_proc.call_count == 2  # 1 股 × (chunk+inc)
+    assert not (main_env / "bs_5m_state.json").exists()  # 冒烟不落 state
+
+
 def test_main_increment_only_when_backfill_done(main_env, monkeypatch):
     """回灌完结盖章(next_end=None) → 只跑每日增量(单 sweep)。"""
     b5.save_chunk_state({"next_end": None})