diff --git a/backend/app/plugins/fuyao/client.py b/backend/app/plugins/fuyao/client.py
index f13693e..e703a79 100644
--- a/backend/app/plugins/fuyao/client.py
+++ b/backend/app/plugins/fuyao/client.py
@@ -207,6 +207,16 @@ class FuyaoClient:
         rows = data.get("item")
         return rows if isinstance(rows, list) else []
 
+    def trading_days(self) -> list[dict]:
+        """近一年 A 股交易日序列 (固定窗口 [今日-1年, 今日], 无入参)。
+
+        返回 data.item 原始行: {date_ms(上海零点), date(yyyyMMdd)}。
+        供交易日探针判定「今天在列表内 ⇔ 交易日」。
+        """
+        data = self._get("/api/a-share/calendar/trading-days", {})
+        rows = data.get("item")
+        return rows if isinstance(rows, list) else []
+
     # ---- 市场 dump ----
     def dump_download_url(self, dump_kind: str) -> dict:
         """获取 dump 预签名下载信息(约 300s 有效)。
diff --git a/backend/app/plugins/fuyao/provider.py b/backend/app/plugins/fuyao/provider.py
index 93def17..82376e0 100644
--- a/backend/app/plugins/fuyao/provider.py
+++ b/backend/app/plugins/fuyao/provider.py
@@ -878,6 +878,15 @@ class FuyaoProvider:
             rows_out.append(row)
         return pl.DataFrame(rows_out) if rows_out else pl.DataFrame()
 
+    def trading_days(self) -> set:
+        """近一年交易日集合 (供交易日探针)。失败抛 FuyaoError, 由探针兜为未知。"""
+        rows = self._get_client().trading_days()
+        return {
+            d
+            for d in (_date_of_ms(r.get("date_ms")) for r in rows)
+            if d is not None
+        }
+
     def _derive_bps(self, symbols: list[str]) -> dict[str, float]:
         """估值快照 pb_mrq 与行情快照最新价同源同刻 → bps = price / pb_mrq。
 
diff --git a/backend/app/services/minute_refresh.py b/backend/app/services/minute_refresh.py
index 2a2bd63..3b21cae 100644
--- a/backend/app/services/minute_refresh.py
+++ b/backend/app/services/minute_refresh.py
@@ -149,6 +149,12 @@ class MinuteRefreshService:
             return "capability"
         if not _in_continuous_session():
             return "outside_trading_hours"
+        # 节假日 (工作日但休市): 周几门控覆盖不到, 由交易日探针剔除。
+        # 未知 (None) 维持现状 — 空轮升级机制兜底 (探针失灵时的第二道防线)。
+        from app.services import trading_day
+
+        if trading_day.is_trading_day() is False:
+            return "holiday"
         return None
 
     # ------------------------------------------------------------------
diff --git a/backend/app/services/quote_service.py b/backend/app/services/quote_service.py
index 1a17521..48f94f8 100644
--- a/backend/app/services/quote_service.py
+++ b/backend/app/services/quote_service.py
@@ -220,6 +220,7 @@ class QuoteService:
         # 午休/收盘最终同步状态: 到边界后必须成功拉取一版行情, 再进入休盘态。
         self._final_sync_done: set[tuple[date, str]] = set()
         self._final_sync_failed: dict[tuple[date, str], str] = {}
+        self._holiday_active = False  # 交易日探针当前是否判休市 (日志去重)
 
     # ================================================================
     # 生命周期
@@ -907,8 +908,29 @@ class QuoteService:
             return (cn_today(), "close")
         return None
 
+    def _holiday_gate(self) -> bool:
+        """交易日探针门控: 确定休市 → False (停止轮询, 含 final 定版)。
+
+        探针未知 (None, 未配置 fuyao 且 tickflow 不可用/开盘缓冲窗内) → True,
+        维持周几近似现状行为。探针是纯读, 不落盘; 休市结论带 TTL 定期复探,
+        误判自愈。首次判定变化打一条日志, 避免每拍刷屏。
+        """
+        from app.services import trading_day
+
+        holiday = trading_day.is_trading_day() is False
+        if holiday != self._holiday_active:
+            self._holiday_active = holiday
+            if holiday:
+                logger.info("交易日探针判定休市, 行情轮询暂停 (30 分钟复探)")
+        return not holiday
+
     def _should_poll_for_phase(self, phase: str) -> bool:
-        """是否处于会主动拉行情的阶段。final 阶段成功后即停止。"""
+        """是否处于会主动拉行情的阶段。final 阶段成功后即停止。
+
+        节假日 (工作日但休市) 由交易日探针剔除 — 周几门控覆盖不到的部分。
+        """
+        if not self._holiday_gate():
+            return False
         if phase in {"preopen", "morning", "pre_afternoon", "afternoon"}:
             return True
         key = self._final_sync_key(phase)
diff --git a/backend/app/services/trading_day.py b/backend/app/services/trading_day.py
new file mode 100644
index 0000000..bfca3f9
--- /dev/null
+++ b/backend/app/services/trading_day.py
@@ -0,0 +1,139 @@
+"""交易日探针 (oracle) — 回答「今天是否 A 股交易日」。
+
+消费方 (实时行情轮询 / 盘中分钟增量) 在周几+时段门控之后调用, 用于把
+「工作日但休市」的节假日从轮询窗口里剔除; 返回 None (未知) 时调用方
+维持现状行为 (周几近似 + 快照新鲜度判据兜底), 不引入新依赖。
+
+探测链 (按确定性排序, 先到先得):
+  1. fuyao 交易日历 (已配置 fuyao 时): GET /api/a-share/calendar/trading-days,
+     今天在近一年交易日列表内 ⇔ 交易日。权威日历, 无时段依赖, 无开盘缓冲问题。
+  2. tickflow 实时行情时间戳: 拉一篮流动性票快照 (单请求), max(timestamp)
+     日期 == 今天 ⇔ 交易日。非交易日全市场戳停在上一交易日 (2026-08-29 周六
+     实测 5551/5551, 含停牌股 — 戳是快照定版时刻, 非最后成交时刻);
+     交易日集合竞价阶段 (9:15-9:30) 戳是否已翻新未实测 → 开盘缓冲窗内
+     戳过期不作数, 保守视为未知。
+  3. 均不可用 → None: 调用方按周几近似继续。
+
+安全约束:
+  - 周末直接返回 False (周几判断零成本, 不打任何请求)。
+  - 探针是纯读: 只产出一个布尔判定, 不落盘、不进行情管道、不碰归属链路。
+  - 只用于「降档」(休市不轮询); 休市结论 TTL 较短 (30 分钟) 定期复探,
+    探针误判最坏损失一段快照且可自愈; 未知结论短 TTL (5 分钟) 防止
+    轮询循环每拍重打失败的探测。
+"""
+
+from __future__ import annotations
+
+import threading
+import time
+from dataclasses import dataclass
+from datetime import datetime, time as dt_time
+
+from app.market_time import CN_TZ, cn_now
+
+# tickflow 戳探针的开盘缓冲窗: 此时刻之前戳仍是上一交易日属正常 (集合竞价),
+# 不据此判休市。周一实测竞价戳翻新时机后可收紧。仅上午首个窗口需要。
+_STALE_BUFFER_UNTIL = dt_time(9, 40)
+
+# 一篮流动性票: 探 max(timestamp), 任一戳为今日即交易日 (OR 语义)。
+# 大盘蓝筹同日全部停牌 = 市场性事件, 与休市同处理无碍。
+_BASKET = ("000001.SZ", "600519.SH", "600036.SH", "601318.SH", "000651.SZ")
+
+_TTL_TRADING_S = 3600.0   # 交易日结论每小时复探 (跨日天然失效)
+_TTL_HOLIDAY_S = 1800.0   # 休市结论 30 分钟复探, 误判自愈上限
+_TTL_UNKNOWN_S = 300.0    # 未知结论 5 分钟后重试探测
+
+_CACHE_LOCK = threading.Lock()
+
+
+@dataclass
+class _Cache:
+    day: object | None = None
+    verdict: bool | None = None
+    probed_at: float = 0.0
+
+
+_CACHE = _Cache()
+
+
+def reset_cache() -> None:
+    """清空探针缓存 (测试用)。"""
+    with _CACHE_LOCK:
+        _CACHE.day = None
+        _CACHE.verdict = None
+        _CACHE.probed_at = 0.0
+
+
+def _probe_fuyao(now: datetime) -> bool | None:
+    """fuyao 交易日历: 今天在列表内 ⇔ 交易日。未配置 fuyao / 失败 → None。"""
+    try:
+        from app.data_providers import custom as custom_sources
+
+        if not custom_sources.is_custom_provider("fuyao"):
+            return None
+        provider = custom_sources.get_provider("fuyao")
+        days = provider.trading_days()
+        return now.date() in days if days else None
+    except Exception:  # noqa: BLE001 — 探针失败按未知处理, 不上抛
+        return None
+
+
+def _probe_tickflow(now: datetime) -> bool | None:
+    """tickflow 行情时间戳: max(timestamp) 日期 == 今天 ⇔ 交易日。
+
+    戳停在上一交易日: 开盘缓冲窗内 → None (可能是竞价未翻新), 窗后 → False。
+    无实时权限 / 网络失败 / 无有效戳 → None。
+    """
+    try:
+        from app.tickflow.client import get_client
+
+        rows = get_client().quotes.get(symbols=list(_BASKET)) or []
+        stamps = [r.get("timestamp") for r in rows if isinstance(r, dict)]
+        valid = [int(t) for t in stamps if isinstance(t, (int, float)) and t]
+        if not valid:
+            return None
+        latest_day = datetime.fromtimestamp(max(valid) / 1000, tz=CN_TZ).date()
+        if latest_day == now.date():
+            return True
+        if now.time() < _STALE_BUFFER_UNTIL:
+            return None
+        return False
+    except Exception:  # noqa: BLE001 — 无权限/网络失败按未知处理
+        return None
+
+
+def is_trading_day(now: datetime | None = None) -> bool | None:
+    """今天是否 A 股交易日。True=交易日, False=确定休市, None=未知 (维持周几近似)。
+
+    周末零成本直判; 工作日走探测链 (fuyao 日历 → tickflow 时间戳),
+    结论按 TTL 缓存。线程安全: 实时行情与分钟增量两个线程共用。
+    """
+    now = now or cn_now()
+    if now.weekday() >= 5:
+        return False
+
+    with _CACHE_LOCK:
+        if (
+            _CACHE.day == now.date()
+            and _CACHE.verdict is not None
+            and (time.monotonic() - _CACHE.probed_at) < _ttl_of(_CACHE.verdict)
+        ):
+            return _CACHE.verdict
+
+    verdict = _probe_fuyao(now)
+    if verdict is None:
+        verdict = _probe_tickflow(now)
+
+    with _CACHE_LOCK:
+        _CACHE.day = now.date()
+        _CACHE.verdict = verdict
+        _CACHE.probed_at = time.monotonic()
+    return verdict
+
+
+def _ttl_of(verdict: bool | None) -> float:
+    if verdict is True:
+        return _TTL_TRADING_S
+    if verdict is False:
+        return _TTL_HOLIDAY_S
+    return _TTL_UNKNOWN_S
diff --git a/backend/tests/test_minute_refresh.py b/backend/tests/test_minute_refresh.py
index f3b22a6..bbe38da 100644
--- a/backend/tests/test_minute_refresh.py
+++ b/backend/tests/test_minute_refresh.py
@@ -79,6 +79,10 @@ def _svc(tmp_path, monkeypatch, *, enabled=True, custom_provider=False, capabili
     svc = MinuteRefreshService(_FakeRepo(["600000.SH"]))
     svc.set_app_state(_FakeAppState(capability))
     monkeypatch.setattr(minute_refresh, "_in_continuous_session", lambda now=None: in_hours)
+    # 交易日探针默认未知 (None → 放行): 隔离真实网络探测, holiday 分支在
+    # test_trading_day.py 单独覆盖
+    from app.services import trading_day
+    monkeypatch.setattr(trading_day, "is_trading_day", lambda now=None: None)
     return svc
 
 
diff --git a/backend/tests/test_trading_day.py b/backend/tests/test_trading_day.py
new file mode 100644
index 0000000..baa6322
--- /dev/null
+++ b/backend/tests/test_trading_day.py
@@ -0,0 +1,257 @@
+"""交易日探针 (trading_day oracle) 与两个消费方接入的测试。
+
+不依赖真实网络: 探测函数 (_probe_fuyao / _probe_tickflow) 全部 monkeypatch。
+覆盖: 周末零成本直判、探测链优先级 (fuyao 日历权威, 无开盘缓冲问题)、
+tickflow 戳的 OR 语义与开盘缓冲窗、失败/无权限 → None、TTL 缓存、
+实时行情门控与分钟增量 gate_reason 的 holiday 分支。
+"""
+
+from __future__ import annotations
+
+from datetime import date, datetime, time as dt_time, timezone, timedelta
+
+import pytest
+
+from app.services import trading_day
+from app.services.trading_day import is_trading_day, reset_cache
+
+CN = timezone(timedelta(hours=8))
+
+
+@pytest.fixture(autouse=True)
+def _clean_cache():
+    reset_cache()
+    yield
+    reset_cache()
+
+
+def _no_probes(monkeypatch):
+    """探测函数替换为爆炸 — 用于验证未被打到。"""
+    monkeypatch.setattr(trading_day, "_probe_fuyao", lambda now: (_ for _ in ()).throw(AssertionError("不应探测")))
+    monkeypatch.setattr(trading_day, "_probe_tickflow", lambda now: (_ for _ in ()).throw(AssertionError("不应探测")))
+
+
+# ---- 周末零成本直判 ----
+
+def test_weekend_returns_false_without_probing(monkeypatch):
+    sat = datetime(2026, 8, 29, 10, 0, tzinfo=CN)  # 周六
+    sun = datetime(2026, 8, 30, 10, 0, tzinfo=CN)  # 周日
+    _no_probes(monkeypatch)
+    assert is_trading_day(sat) is False
+    assert is_trading_day(sun) is False
+
+
+# ---- 探测链优先级 ----
+
+def test_fuyao_calendar_is_authoritative_even_before_open(monkeypatch):
+    """fuyao 日历结论无时段依赖: 开盘缓冲窗内也直接生效。"""
+    holiday_mon = datetime(2026, 9, 7, 9, 31, tzinfo=CN)  # 周一 (缓冲窗内)
+    monkeypatch.setattr(trading_day, "_probe_fuyao", lambda now: False)
+    monkeypatch.setattr(
+        trading_day, "_probe_tickflow",
+        lambda now: (_ for _ in ()).throw(AssertionError("fuyao 已有结论不应继续探测")),
+    )
+    assert is_trading_day(holiday_mon) is False
+
+
+def test_chain_falls_through_to_tickflow_when_fuyao_unknown(monkeypatch):
+    monday = datetime(2026, 9, 7, 10, 0, tzinfo=CN)
+    monkeypatch.setattr(trading_day, "_probe_fuyao", lambda now: None)
+    monkeypatch.setattr(trading_day, "_probe_tickflow", lambda now: True)
+    assert is_trading_day(monday) is True
+
+
+def test_all_probes_unknown_returns_none(monkeypatch):
+    monday = datetime(2026, 9, 7, 10, 0, tzinfo=CN)
+    monkeypatch.setattr(trading_day, "_probe_fuyao", lambda now: None)
+    monkeypatch.setattr(trading_day, "_probe_tickflow", lambda now: None)
+    assert is_trading_day(monday) is None
+
+
+# ---- tickflow 戳语义 ----
+
+def test_tickflow_stale_stamp_before_buffer_is_unknown(monkeypatch):
+    """开盘缓冲窗内戳停在昨日: 可能是集合竞价未翻新, 保守判未知。"""
+    monday_935 = datetime(2026, 9, 7, 9, 35, tzinfo=CN)
+    import app.tickflow.client as tf_client_mod
+
+    class _FakeQuotes:
+        def get(self, symbols):
+            # 周一 9:35 拉到上周五 15:30 的戳
+            return [{"symbol": s, "timestamp": 1787902251001} for s in symbols]
+
+    class _FakeClient:
+        quotes = _FakeQuotes()
+
+    monkeypatch.setattr(tf_client_mod, "get_client", lambda: _FakeClient())
+    monkeypatch.setattr(trading_day, "_probe_fuyao", lambda now: None)
+    assert trading_day._probe_tickflow(monday_935) is None
+
+
+def test_tickflow_stale_stamp_after_buffer_is_holiday(monkeypatch):
+    monday_1041 = datetime(2026, 9, 7, 10, 41, tzinfo=CN)
+    import app.tickflow.client as tf_client_mod
+
+    class _FakeQuotes:
+        def get(self, symbols):
+            return [{"symbol": s, "timestamp": 1787902251001} for s in symbols]  # 上周五
+
+    class _FakeClient:
+        quotes = _FakeQuotes()
+
+    monkeypatch.setattr(tf_client_mod, "get_client", lambda: _FakeClient())
+    assert trading_day._probe_tickflow(monday_1041) is False
+
+
+def test_tickflow_fresh_stamp_is_trading_anytime(monkeypatch):
+    """缓冲窗内只要戳是今天就判交易日 (OR 语义, 任一翻新即可)。"""
+    monday_920 = datetime(2026, 9, 7, 9, 20, tzinfo=CN)
+    import app.tickflow.client as tf_client_mod
+
+    class _FakeQuotes:
+        def get(self, symbols):
+            # 一只翻新 + 其余停在周五 → max 为今日
+            fresh_ms = int(monday_920.timestamp() * 1000)
+            return [
+                {"symbol": "000001.SZ", "timestamp": fresh_ms},
+                {"symbol": "600519.SH", "timestamp": 1787902251001},
+            ]
+
+    class _FakeClient:
+        quotes = _FakeQuotes()
+
+    monkeypatch.setattr(tf_client_mod, "get_client", lambda: _FakeClient())
+    assert trading_day._probe_tickflow(monday_920) is True
+
+
+def test_tickflow_error_returns_none(monkeypatch):
+    monday = datetime(2026, 9, 7, 10, 41, tzinfo=CN)
+    import app.tickflow.client as tf_client_mod
+
+    def _boom():
+        raise RuntimeError("无实时权限 (free 档)")
+
+    monkeypatch.setattr(tf_client_mod, "get_client", _boom)
+    assert trading_day._probe_tickflow(monday) is None
+
+
+# ---- TTL 缓存 ----
+
+def test_verdict_cached_within_ttl(monkeypatch):
+    monday = datetime(2026, 9, 7, 10, 0, tzinfo=CN)
+    calls = {"n": 0}
+
+    def _counting_probe(now):
+        calls["n"] += 1
+        return True
+
+    monkeypatch.setattr(trading_day, "_probe_fuyao", _counting_probe)
+    assert is_trading_day(monday) is True
+    assert is_trading_day(monday) is True
+    assert is_trading_day(monday) is True
+    assert calls["n"] == 1  # 命中缓存, 只探一次
+
+
+def test_unknown_verdict_retries_after_short_ttl(monkeypatch):
+    monday = datetime(2026, 9, 7, 10, 0, tzinfo=CN)
+    calls = {"n": 0}
+
+    def _counting_probe(now):
+        calls["n"] += 1
+        return None
+
+    monkeypatch.setattr(trading_day, "_probe_fuyao", _counting_probe)
+    monkeypatch.setattr(trading_day, "_probe_tickflow", lambda now: None)  # 隔离真实网络
+    assert is_trading_day(monday) is None
+    # 手动把缓存时间拨回 10 分钟前 (超过 unknown TTL 300s) → 重探
+    with trading_day._CACHE_LOCK:
+        trading_day._CACHE.probed_at -= 600
+    assert is_trading_day(monday) is None
+    assert calls["n"] == 2
+
+
+# ---- 消费方 1: 实时行情门控 ----
+
+def test_quote_service_holiday_gate_blocks_polling(monkeypatch):
+    from app.services.quote_service import QuoteService
+
+    qs = QuoteService()
+    monkeypatch.setattr(trading_day, "is_trading_day", lambda now=None: False)
+    assert qs._should_poll_for_phase("morning") is False
+    assert qs._should_poll_for_phase("preopen") is False
+    # final 定版同样被剔除: 休市日没有需要定版的当日行情
+    assert qs._should_poll_for_phase("close_final") is False
+
+
+def test_quote_service_polls_when_trading_or_unknown(monkeypatch):
+    from app.services.quote_service import QuoteService
+
+    qs = QuoteService()
+    monkeypatch.setattr(trading_day, "is_trading_day", lambda now=None: True)
+    assert qs._should_poll_for_phase("morning") is True
+    # 未知 → 维持现状 (周几近似)
+    monkeypatch.setattr(trading_day, "is_trading_day", lambda now=None: None)
+    assert qs._should_poll_for_phase("morning") is True
+
+
+# ---- 消费方 2: 分钟增量 gate_reason ----
+
+def _minute_service(monkeypatch):
+    from app.services.minute_refresh import MinuteRefreshService
+
+    svc = MinuteRefreshService.__new__(MinuteRefreshService)
+    svc._app_state = None
+    monkeypatch.setattr(
+        "app.services.minute_refresh.preferences.get_minute_refresh_enabled",
+        lambda: True,
+    )
+    monkeypatch.setattr(svc, "custom_provider_active", lambda: False)
+    monkeypatch.setattr(svc, "capability_ok", lambda: True)
+    return svc
+
+
+def test_minute_refresh_gate_returns_holiday(monkeypatch):
+    """周几+时段门控放行 (周一盘中) 但探针判休市 → holiday。"""
+    svc = _minute_service(monkeypatch)
+    monday_1030 = datetime(2026, 9, 7, 10, 30, tzinfo=CN)
+    monkeypatch.setattr(
+        "app.services.minute_refresh._in_continuous_session", lambda now=None: True
+    )
+    monkeypatch.setattr(trading_day, "is_trading_day", lambda now=None: False)
+    assert svc._gate_reason() == "holiday"
+
+
+def test_minute_refresh_gate_passes_when_trading(monkeypatch):
+    svc = _minute_service(monkeypatch)
+    monkeypatch.setattr(
+        "app.services.minute_refresh._in_continuous_session", lambda now=None: True
+    )
+    monkeypatch.setattr(trading_day, "is_trading_day", lambda now=None: True)
+    assert svc._gate_reason() is None
+
+
+# ---- fuyao 日历解析 ----
+
+def test_fuyao_provider_trading_days_conversion(monkeypatch):
+    from app.plugins.fuyao.provider import FuyaoProvider
+    from app.plugins.fuyao import provider as fp
+
+    class _CalClient:
+        def trading_days(self):
+            # 上海零点戳按 provider 的 _ms_of_date 口径构造
+            def _midnight_ms(d):
+                import calendar
+                return (calendar.timegm(d.timetuple()) - 28800) * 1000
+
+            d4, d7 = date(2026, 9, 4), date(2026, 9, 7)
+            return [
+                {"date": "20260904", "date_ms": _midnight_ms(d4)},
+                {"date": "20260907", "date_ms": _midnight_ms(d7)},
+            ]
+
+    monkeypatch.setattr(
+        fp, "fuyao_client", type("M", (), {"FuyaoClient": lambda **kw: _CalClient()})
+    )
+    monkeypatch.setattr(fp, "get_api_key", lambda: "test-key")
+    days = FuyaoProvider().trading_days()
+    assert days == {date(2026, 9, 4), date(2026, 9, 7)}