diff --git a/backend/app/strategy/engine.py b/backend/app/strategy/engine.py
index 21e88e8f..3f43bc10 100644
--- a/backend/app/strategy/engine.py
+++ b/backend/app/strategy/engine.py
@@ -233,22 +233,32 @@ class _RealtimeMatrixEntry:
     buffer: Any
 
 
-def _resolve_required_features(meta: dict, mod, filter_history_fn) -> frozenset[str]:
+def _resolve_required_features(meta: dict, mod, filter_history_fn, path: Path) -> frozenset[str]:
     """显式声明 (META/module REQUIRED_FEATURES) 优先; 缺失且存在动态
     filter_history 时, AST 推导列依赖兜底 — 推导不可证明则保持为空,
-    回测层继续走全量指标计算 (fail-closed)。"""
+    回测层继续走全量指标计算 (fail-closed)。
+
+    推导范围是整个策略文件 + 同目录 `_*.py` 依赖文件, 不只是 filter_history
+    函数体: 列引用在模块级辅助函数或依赖文件里硬编码时, 只看函数体会漏列,
+    回测帧缺列直接 ColumnNotFoundError。范围放宽只会多载列, 不会漏。"""
     declared = frozenset(meta.get("required_features", []) or []) | frozenset(
         getattr(mod, "REQUIRED_FEATURES", []) or []
     )
     if declared or filter_history_fn is None:
         return declared
-    from app.strategy.feature_deps import infer_filter_history_features
+    from app.strategy.feature_deps import infer_features_from_sources
 
-    inferred = infer_filter_history_features(filter_history_fn)
+    family = [path, *sorted(p for p in path.parent.glob("_*.py") if p != path)]
+    try:
+        sources = [p.read_text(encoding="utf-8") for p in family]
+    except OSError as e:
+        logger.debug("strategy %s: 依赖源码读取失败, 保持全量兜底: %s", meta.get("id", "<unknown>"), e)
+        return declared
+    inferred = infer_features_from_sources(sources)
     if inferred is None:
         return declared
     logger.info(
-        "strategy %s: filter_history AST 推导出 %d 个依赖列, 免除回测全量兜底",
+        "strategy %s: 依赖源码 AST 推导出 %d 个依赖列, 免除回测全量兜底",
         meta.get("id", "<unknown>"),
         len(inferred),
     )
@@ -604,7 +614,7 @@ class StrategyEngine:
             max_hold_days=getattr(mod, "MAX_HOLD_DAYS", None),
             filter_fn=filter_fn,
             filter_history_fn=filter_history_fn,
-            required_features=_resolve_required_features(meta, mod, filter_history_fn),
+            required_features=_resolve_required_features(meta, mod, filter_history_fn, path),
             lookback_days=int(getattr(mod, "LOOKBACK_DAYS", meta.get("lookback_days", 1)) or 1),
             source=source,
             file_path=path,
diff --git a/backend/app/strategy/feature_deps.py b/backend/app/strategy/feature_deps.py
index 2a99cf68..f215eea8 100644
--- a/backend/app/strategy/feature_deps.py
+++ b/backend/app/strategy/feature_deps.py
@@ -2,8 +2,9 @@
 
 背景: 声明了 filter_history (动态 Python 过滤) 但没有声明 REQUIRED_FEATURES 的
 策略, 回测无法静态推断需要哪些列, 只能退回"计算全部指标"(backtest/strategy.py
-的 full_fallback, 结果正确但白白多算)。本模块对函数体做 AST 静态追踪, 收集
-列引用常量, 让绝大多数此类策略拿到精确依赖, 消灭全量兜底。
+的 full_fallback, 结果正确但白白多算)。本模块对策略文件及其 `_*.py` 依赖文件
+做 AST 静态追踪, 收集列引用常量 (含模块级辅助函数), 让绝大多数此类策略拿到
+精确依赖, 消灭全量兜底。
 
 fail-closed 契约: 任何无法证明的形态 — 动态列名、pl.all()/polars.selectors、
 完全收集不到列引用 — 一律返回 None, 调用方保持原有全量兜底。宁可慢,
@@ -75,25 +76,39 @@ def _collect_from_source(source: str) -> tuple[set[str], bool]:
 
 
 def infer_filter_history_features(fn) -> frozenset[str] | None:
-    """推导 filter_history 引用的输入列; None = 不可推导 (调用方保持全量兜底)。
+    """推导单个 filter_history 函数引用的输入列; None = 不可推导。
 
-    只保留已知输入列 (enriched 存储/指标/证券维表), `_` 前缀的中间列
-    (函数内 with_columns 先建后用的临时列) 不是输入依赖, 剔除。
+    只看函数自身源码 — 覆盖不了"同模块辅助函数/`_*.py` 依赖文件里硬编码列"
+    的形态, 引擎路径请用 infer_features_from_sources (整家族文件一起推导)。
     """
-    from app.indicators.pipeline import ENRICHED_STORAGE_COLS, INDICATOR_COLUMNS
-
     try:
-        # 嵌套定义的函数 getsource 带原始缩进, 直接 parse 会 IndentationError。
         source = textwrap.dedent(inspect.getsource(fn))
     except (OSError, TypeError) as e:
         logger.debug("feature inference: no source for %r: %s", getattr(fn, "__name__", fn), e)
         return None
-    try:
-        names, uninferable = _collect_from_source(source)
-    except SyntaxError:
-        return None  # 已加载模块不应有语法错误; 防御性 fail-closed
-    if uninferable or not names:
-        # 收集不到列引用 (如 df["x"] 下标风格) 与存在动态形态同样不可证明。
+    return infer_features_from_sources([source])
+
+
+def infer_features_from_sources(sources) -> frozenset[str] | None:
+    """对一组源码 (策略主文件 + `_*.py` 依赖) 整体推导输入列。
+
+    家族内任一文件出现不可证明形态 (动态列名/pl.all/cs.*) 即整体返回 None —
+    辅助函数漏列会让回测帧缺列, 宁可整体回退全量兜底。
+    其余 fail-closed 契约与单函数版一致。
+    """
+    from app.indicators.pipeline import ENRICHED_STORAGE_COLS, INDICATOR_COLUMNS
+
+    names: set[str] = set()
+    for raw in sources:
+        try:
+            collected, uninferable = _collect_from_source(textwrap.dedent(raw))
+        except SyntaxError:
+            return None  # 家族文件解析失败按不可证明处理
+        if uninferable:
+            return None
+        names |= collected
+    if not names:
+        # 收集不到列引用 (如 df["x"] 下标风格) 同样不可证明。
         return None
     known = set(ENRICHED_STORAGE_COLS) | set(INDICATOR_COLUMNS) | {"name", "total_shares", "float_shares"}
     features = frozenset(n for n in names if n in known and not n.startswith("_"))
diff --git a/backend/tests/test_feature_deps_inference.py b/backend/tests/test_feature_deps_inference.py
index 27d684fa..39512f1a 100644
--- a/backend/tests/test_feature_deps_inference.py
+++ b/backend/tests/test_feature_deps_inference.py
@@ -135,3 +135,87 @@ def test_engine_explicit_declaration_wins(tmp_path):
     engine = _engine_with(tmp_path, source)
     assert not engine.load_errors()
     assert engine.get("custom_inf_ok").required_features == frozenset({"close"})
+
+
+# ── 家族推导: 模块级辅助函数 + `_*.py` 依赖文件 ────────────
+# 回归: 只解析 filter_history 函数体会漏掉这些位置硬编码的列 → 回测帧缺列
+# ColumnNotFoundError。范围放宽只会多载列, 不会漏。
+
+_HELPER = '''\
+META = {"id": "custom_inf_helper", "name": "helper", "description": "", "tags": []}
+
+import polars as pl
+
+
+def _trend_ok(df: pl.DataFrame) -> pl.Expr:
+    return pl.col("ma20") > pl.col("ma60")
+
+
+def filter_history(df: pl.DataFrame, params: dict) -> pl.DataFrame:
+    return df.filter(_trend_ok(df) & (pl.col("close") > 1))
+'''
+
+_DEP_IMPORTER = '''\
+META = {"id": "custom_inf_dep", "name": "dep", "description": "", "tags": []}
+
+import polars as pl
+
+import _dep
+
+
+def filter_history(df: pl.DataFrame, params: dict) -> pl.DataFrame:
+    return df.filter(_dep.momentum_ok("rsi_6") & (pl.col("close") > 1))
+'''
+
+_DEP_FILE = '''\
+import polars as pl
+
+
+def momentum_ok(col_name: str) -> pl.Expr:
+    # 实现固定引用 rsi_6 (col_name 参数仅供调用方语义, 不参与列选择)
+    return pl.col("rsi_6") < 30
+'''
+
+_DEP_FILE_DYNAMIC = '''\
+import polars as pl
+
+
+def momentum_ok(col_name: str) -> pl.Expr:
+    # 列名经参数传递 — 调用方可传任意列, AST 常量收集无法证明
+    return pl.col(col_name) < 30
+'''
+
+
+def test_engine_infers_module_level_helper_columns(tmp_path):
+    engine = _engine_with(tmp_path, _HELPER)
+    assert not engine.load_errors()
+    s = engine.get("custom_inf_helper")
+    assert s is not None
+    # ma20/ma60 在辅助函数里, 不在 filter_history 函数体内 — 必须仍被推导
+    assert s.required_features == frozenset({"close", "ma20", "ma60"})
+
+
+def test_engine_infers_dependency_file_columns(tmp_path):
+    d = tmp_path / "custom"
+    d.mkdir(parents=True)
+    (d / "custom_inf_dep.py").write_text(_DEP_IMPORTER, encoding="utf-8")
+    (d / "_dep.py").write_text(_DEP_FILE, encoding="utf-8")
+    engine = StrategyEngine(strategy_dirs=[d])
+    assert not engine.load_errors()
+    s = engine.get("custom_inf_dep")
+    assert s is not None
+    # rsi_6 只存在于 `_dep.py` — 家族推导必须覆盖依赖文件
+    assert s.required_features == frozenset({"close", "rsi_6"})
+
+
+def test_engine_family_fail_closed_on_dynamic_dependency(tmp_path):
+    """依赖文件里出现动态列名 → 整个家族不可证明 → 保持全量兜底。"""
+    d = tmp_path / "custom"
+    d.mkdir(parents=True)
+    (d / "custom_inf_dep.py").write_text(_DEP_IMPORTER, encoding="utf-8")
+    (d / "_dep.py").write_text(_DEP_FILE_DYNAMIC, encoding="utf-8")
+    engine = StrategyEngine(strategy_dirs=[d])
+    assert not engine.load_errors()
+    s = engine.get("custom_inf_dep")
+    assert s is not None
+    assert s.required_features == frozenset()