diff --git a/Dockerfile b/Dockerfile
index 36ec384..6665c19 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -72,5 +72,8 @@ ENV STATIC_DIR=/app/static \
 COPY --from=frontend-builder /build/dist ./static
 
 ENV PYTHONPATH=/app
+# 兜底时区: 交易时段判断已在代码里显式用北京时间 (app/market_time.py),
+# 此处让日志时间戳等其余 naive 时间也对齐北京时间。
+ENV TZ=Asia/Shanghai
 EXPOSE 3018
 CMD ["uv", "run", "uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "3018"]
diff --git a/backend/app/market_time.py b/backend/app/market_time.py
new file mode 100644
index 0000000..17895e2
--- /dev/null
+++ b/backend/app/market_time.py
@@ -0,0 +1,21 @@
+"""A股市场时间工具 — 固定北京时间 (UTC+8, 无夏令时)。
+
+服务器/容器本地时区不可靠 (python:slim 镜像默认 UTC), 交易时段判断、
+实时行情落盘日期等必须显式使用北京时间, 否则 Docker 部署时轮询窗口
+与真实交易时段完全错开 (北京 9:15-15:05 = UTC 1:15-7:05)。
+"""
+from __future__ import annotations
+
+from datetime import date, datetime, timedelta, timezone
+
+CN_TZ = timezone(timedelta(hours=8))
+
+
+def cn_now() -> datetime:
+    """当前北京时间 (带时区)。"""
+    return datetime.now(CN_TZ)
+
+
+def cn_today() -> date:
+    """当前北京日期。"""
+    return datetime.now(CN_TZ).date()
diff --git a/backend/app/services/depth_service.py b/backend/app/services/depth_service.py
index 1e5c423..fa16803 100644
--- a/backend/app/services/depth_service.py
+++ b/backend/app/services/depth_service.py
@@ -24,7 +24,9 @@ import logging
 import math
 import threading
 import time
-from datetime import date, datetime, time as dt_time
+from datetime import date, time as dt_time
+
+from app.market_time import cn_now, cn_today
 from pathlib import Path
 
 import polars as pl
@@ -89,7 +91,7 @@ class DepthService:
         if not self._has_capability():
             logger.info("depth sealed: 无 DEPTH5_BATCH 能力, 跳过启动补跑")
             return
-        today = date.today()
+        today = cn_today()
         if self._persisted_for_date(today):
             # parquet 已存在: 恢复内存缓存(避免重启后每次查询都读 parquet)
             self._restore_from_parquet(today)
@@ -579,7 +581,8 @@ class DepthService:
 
     @staticmethod
     def _is_trading_hours() -> bool:
-        now = datetime.now()
+        # 显式北京时间: 容器/服务器本地时区可能是 UTC, 用 naive now() 会整体错开轮询窗口
+        now = cn_now()
         t = now.time()
         morning = dt_time(9, 25) <= t <= dt_time(11, 35)
         afternoon = dt_time(12, 55) <= t <= dt_time(15, 5)
diff --git a/backend/app/services/quote_service.py b/backend/app/services/quote_service.py
index 2948f9b..3d27857 100644
--- a/backend/app/services/quote_service.py
+++ b/backend/app/services/quote_service.py
@@ -26,10 +26,12 @@ from __future__ import annotations
 import logging
 import threading
 import time
-from datetime import date, datetime, time as dt_time
+from datetime import date, time as dt_time
 
 import polars as pl
 
+from app.market_time import cn_now, cn_today
+
 logger = logging.getLogger(__name__)
 
 
@@ -584,7 +586,7 @@ class QuoteService:
         if not select_exprs:
             return pl.DataFrame()
         result = df.select(select_exprs).with_columns(
-            pl.lit(date.today()).cast(pl.Date).alias("date"),
+            pl.lit(cn_today()).cast(pl.Date).alias("date"),
         )
         # 修复: API 在非交易时段可能返回 open/high/low=0 或 null,
         # 导致蜡烛从 0 开始。用 close 填充这些异常值。
@@ -643,7 +645,8 @@ class QuoteService:
 
     @staticmethod
     def _is_trading_hours() -> bool:
-        now = datetime.now()
+        # 显式北京时间: 容器/服务器本地时区可能是 UTC, 用 naive now() 会整体错开轮询窗口
+        now = cn_now()
         t = now.time()
         morning = dt_time(9, 15) <= t <= dt_time(11, 35)
         afternoon = dt_time(12, 55) <= t <= dt_time(15, 5)
@@ -879,7 +882,7 @@ class QuoteService:
                      不写 daily, 直接传给 compute_enriched_today 避免重复计算。
         """
         try:
-            today = date.today()
+            today = cn_today()
             t0 = time.perf_counter()
 
             # ---- 尝试增量路径 ----
diff --git a/backend/app/strategy/monitor.py b/backend/app/strategy/monitor.py
index 99d92ca..d04a104 100644
--- a/backend/app/strategy/monitor.py
+++ b/backend/app/strategy/monitor.py
@@ -19,6 +19,7 @@ from typing import Any, Callable
 
 import polars as pl
 
+from app.market_time import cn_today
 from app.strategy.custom_signals import _OP_BUILDERS  # type: ignore  # 复用运算符构造器
 from app.strategy import config as _strategy_config
 
@@ -555,7 +556,7 @@ class MonitorRuleEngine:
         # 现接入 history_loader, 拼历史窗口 + 今日实时行情, 经 precomputed_history 喂给引擎。
         # loader 为 None (未装配) 时退回跳过, 保持旧行为, 不破坏无历史场景。
         run_kwargs: dict = {
-            "as_of": _dt.date.today(),
+            "as_of": cn_today(),
             "overrides": overrides,
         }
         if s.filter_history_fn:
@@ -563,7 +564,7 @@ class MonitorRuleEngine:
                 logger.debug("策略 %s 需要历史数据但未注入 history_loader, 跳过实时监控", sid)
                 return []
             try:
-                today = _dt.date.today()
+                today = cn_today()
                 lookback = max(1, getattr(s, "lookback_days", 30))
                 hist_df = self._history_loader(today, lookback)
                 if hist_df is None or hist_df.is_empty():
@@ -597,7 +598,7 @@ class MonitorRuleEngine:
             import math
             self._latest_strategy_results[sid] = {
                 "total": result.total,
-                "as_of": str(_dt.date.today()),
+                "as_of": str(cn_today()),
                 "rows": [
                     {k: (None if isinstance(v, float) and not math.isfinite(v) else v)
                      for k, v in row.items()}