diff --git a/sanguo_factor/challenger_lgbm.py b/sanguo_factor/challenger_lgbm.py
index 9204c60d..cea2b57f 100644
--- a/sanguo_factor/challenger_lgbm.py
+++ b/sanguo_factor/challenger_lgbm.py
@@ -186,12 +186,18 @@ def _read_value_parquet(path: str) -> pd.DataFrame | None:
     """读因子宽表 parquet;坏件/空件/索引不可转 datetime → None(codex 复审 M-5).
 
     结构化剔除走缺源 skip 语义,不裸抛 AttributeError/ArrowInvalid.
+    索引须严格升序且唯一(codex 尾批):embargo 的 shift(-2) 以位置序为地基,
+    乱序/重复日期件拒收.
     """
     try:
         df = pd.read_parquet(path)
         if df.empty or df.columns.empty:
             return None
         idx = pd.to_datetime(df.index)
+        if not (idx.is_monotonic_increasing and idx.is_unique):
+            print(f"[challenger] ⚠️ parquet 索引乱序/重复: {path} "
+                  f"(monotonic={idx.is_monotonic_increasing}, unique={idx.is_unique})")
+            return None
     except Exception as exc:
         print(f"[challenger] ⚠️ parquet 不可读: {path} ({exc!r})")
         return None
diff --git a/tests/factor/test_challenger_lgbm.py b/tests/factor/test_challenger_lgbm.py
index d57e3be6..56a185f9 100644
--- a/tests/factor/test_challenger_lgbm.py
+++ b/tests/factor/test_challenger_lgbm.py
@@ -336,3 +336,26 @@ def test_redundancy_flags_per_day_unit():
     assert ("x", "z") not in pairs and ("y", "z") not in pairs  # 独立源不标
     xy = next(f for f in flagged if (f["a"], f["b"]) == ("x", "y"))
     assert xy["corr"] == pytest.approx(1.0, abs=1e-6)
+
+
+def test_unsorted_or_dupe_index_parquet_rejected(tmp_path, monkeypatch, capsys):
+    """codex 复审尾批:乱序/重复日期件 structured reject 并入缺源 skip.
+
+    embargo 的 shift(-2) 数学以位置序为地基,乱序/重复日期件必须拒."""
+    from sanguo_factor import challenger_lgbm as cl
+    idx = pd.date_range("2025-01-01", "2025-03-31", freq="B")
+    vdir = tmp_path / "vals"; vdir.mkdir()
+    good = pd.DataFrame(np.zeros((len(idx), 2)), index=idx, columns=["a", "b"])
+    good.to_parquet(vdir / "s0.parquet")
+    good.iloc[::-1].to_parquet(vdir / "s1.parquet")            # 乱序:日期倒排
+    pd.concat([good.iloc[:1], good]).to_parquet(vdir / "s2.parquet")  # 重复首日
+    monkeypatch.setattr(cl, "load_pool", lambda: {
+        n: {"direction": "+", "weight": 1.0 / 3} for n in ("s0", "s1", "s2")})
+    rc = cl.main(["--values-dir", str(vdir), "--as-of", "2025-03-31",
+                  "--out-dir", str(tmp_path), "--vnpy-db", "fake.db"])
+    assert rc == 0
+    assert not (tmp_path / "challenger_lgbm").exists()
+    out = capsys.readouterr().out
+    assert "expected=3" in out and "loaded=1" in out
+    assert "s1" in out and "s2" in out
+    assert "乱序" in out