diff --git a/sanguo_factor/composite_weighting.py b/sanguo_factor/composite_weighting.py
index 3c331f8..f7d9bb0 100644
--- a/sanguo_factor/composite_weighting.py
+++ b/sanguo_factor/composite_weighting.py
@@ -15,21 +15,27 @@ composite_quant12_v2a;方向/包裹口径完全复用 composite_library v1.1
   权重 6 位定点落表达式(可复现、可 diff).
 
 与 v1.1 关系: composite_quant12/fund6/all18 等权式零改动(v1.1 测试锁死);
-v2a 为独立注册名.档案 sources 方向表须与 composite_library.QUANT_SOURCES
-逐对一致(硬校验——档案只给权重,方向唯一权威在代码源表,防两轨漂移).
-幂等: 注册名已存在直接跳过(与 composite_library._register_all 同语义).
+v2a 为独立注册名.档案 sources 方向表须与三源表之一(QUANT_SOURCES /
+FUND_NEU_SOURCES / 两者合并18源)逐对一致(硬校验——档案只给权重,方向唯一
+权威在代码源表,防两轨漂移).幂等: 注册名已存在直接跳过(同 _register_all 语义);
+v2b 档案(all18_v2b_v1.json)由数据拟合产出,存在才注册,缺省静默跳过.
 """
 import json
 from dataclasses import dataclass
 from pathlib import Path
 
 from . import composite_library
+from .fundamental_neutralize import FUND_NEU_SOURCES
 from .registry import register_factor, get_factor, _REGISTRY
 
 # 默认 L1 档案: 相对本文件定位(与代码同仓同版本,不依赖 cwd)
 _DEFAULT_PROFILE_PATH = Path(__file__).parent / "weight_profiles" / "quant12_icirfit_v1.json"
 _DEFAULT_COMPOSITE_NAME = "composite_quant12_v2a"
 
+# v2b(财务源市值中性化)档案: 由后续数据拟合产出,存在才注册(graceful,不 ImportError)
+_V2B_PROFILE_PATH = Path(__file__).parent / "weight_profiles" / "all18_v2b_v1.json"
+_V2B_COMPOSITE_NAME = "composite_all18_v2b"
+
 
 @dataclass(frozen=True)
 class WeightProfile:
@@ -105,25 +111,32 @@ def build_weighted_expression(terms: list[tuple[str, float]]) -> str:
 def register_composite_from_profile(profile: WeightProfile, name: str) -> None:
     """按档案权重注册合成因子(幂等,名字已注册跳过).
 
-    档案 sources 方向表须与 composite_library.QUANT_SOURCES 完全一致
-    (名字集合 + direction 逐对相等,不一致 raise ValueError——先于幂等跳过,
-    漂移不被静默吞掉);项形态按源 category 走 rank_term/_embed_term
-    (复用 v1.1 两函数,口径不漂移);源因子必须已注册(get_factor,缺则 raise).
+    档案 sources 方向表须与三源表之一逐对一致(v2b 起): QUANT_SOURCES /
+    FUND_NEU_SOURCES / 两者拼接 18 源(名字集合 + direction 逐对相等,不一致
+    raise ValueError——先于幂等跳过,漂移不被静默吞掉);项形态按源 category 走
+    rank_term/_embed_term(复用 v1.1 两函数,口径不漂移);源因子必须已注册
+    (get_factor,缺则 raise).
     """
-    expected = dict(composite_library.QUANT_SOURCES)
     declared = {src: d for src, (d, _w) in profile.sources.items()}
-    if declared != expected:
+    matched: list[tuple[str, str]] | None = None
+    for table in (composite_library.QUANT_SOURCES,
+                  FUND_NEU_SOURCES,
+                  composite_library.QUANT_SOURCES + FUND_NEU_SOURCES):
+        if declared == dict(table):
+            matched = table
+            break
+    if matched is None:
         raise ValueError(
-            "档案源方向表与 composite_library.QUANT_SOURCES 不一致"
+            "档案源方向表与三源表(QUANT_SOURCES/FUND_NEU_SOURCES/两者合并18源)均不一致"
             "(名字集合+方向须逐对相等): "
-            f"档案={sorted(declared.items())} 期望={sorted(expected.items())}"
+            f"档案={sorted(declared.items())}"
         )
     if name in _REGISTRY:
         return
 
     weights = resolve_weights(profile)
     terms = []
-    for src_name, direction in composite_library.QUANT_SOURCES:  # 按源表顺序拼装
+    for src_name, direction in matched:  # 按匹配源表顺序拼装
         src = get_factor(src_name)
         if src is None:
             raise ValueError(f"合成源未注册: {src_name}")
@@ -136,10 +149,17 @@ def register_composite_from_profile(profile: WeightProfile, name: str) -> None:
 
 
 def _register_all() -> None:
-    """幂等注册默认 v2a 合成因子(先幂等重挂 v1.1 源,registry 被清后可独立重建)."""
+    """幂等注册默认 v2a 合成因子(先幂等重挂 v1.1 源,registry 被清后可独立重建).
+
+    v2b(all18_v2b)档案存在才注册;不存在静默跳过(档案由后续数据拟合产出,
+    文件到位即自动注册,不 ImportError).
+    """
     composite_library._register_all()
     register_composite_from_profile(load_profile(str(_DEFAULT_PROFILE_PATH)),
                                     _DEFAULT_COMPOSITE_NAME)
+    if _V2B_PROFILE_PATH.exists():
+        register_composite_from_profile(load_profile(str(_V2B_PROFILE_PATH)),
+                                        _V2B_COMPOSITE_NAME)
 
 
 # 模块导入时自动注册(与 composite_library 同模式);失败给可读错误(fail-fast)
diff --git a/sanguo_factor/fundamental_neutralize.py b/sanguo_factor/fundamental_neutralize.py
new file mode 100644
index 0000000..9158a74
--- /dev/null
+++ b/sanguo_factor/fundamental_neutralize.py
@@ -0,0 +1,134 @@
+"""合成层 v2b: 财务源市值中性化 —— cs_neutralize 截面 OLS 残差算子 + fund_*_neu 六源.
+
+治「财务源 2021 后沦为微盘风格代理稀释合成」: 财务源因子对总市值(size)截面
+中性化取残差,剥离 size 因子暴露后仅留财务信息本身.中性化变量只用 size
+(close × share_capital 总市值,表达式层两列现成可得);BP 不进中性化变量——
+fund_bp 自身即 BP,对自身回归残差恒零.
+
+cs_neutralize(y, x): 逐日截面 OLS 残差 resid = y − a − b·x
+(b=cov(x,y)/var(x), a=mean(y)−b·mean(x)),纯 polars over("datetime") 聚合代数
+(cs_rank 同款窗口广播,无 python 逐组循环).边界: 当日有效配对样本 <3 或
+var(x)=0 → 该日残差 null;x/y 任一 null 的行残差 null(配对掩码,缺一侧的行
+不进回归统计).注册进 vnpy EXPRESSION_FUNCTIONS(fast_ops 官方扩展点,导入即注册,
+表达式字符串求值可达).
+
+FUND_NEU_SOURCES: 6 项 = composite_library.FUND_SOURCES 同名源加 _neu 后缀,
+方向全 "+"(中性化因子保持「高=好」语义,负号在表达式内定向,同原源模式).
+neu 表达式 = cs_rank((±)cs_neutralize(<原指标式>, size)),其中原指标式与负号
+严格从注册表原源表达式剥掉外层 cs_rank 后代码取得(不手抄,防两处漂移);
+原内层负号(如 '-nsi')移到 cs_neutralize 外——OLS 线性 resid(−y)=−resid(y),
+统一「中性化正指标+外置符号」形态.
+"""
+import os
+import sys
+
+import polars as pl
+
+# Inject vnpy source path (follow fast_ops / tests conftest pattern)
+_VNPY_SRC = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "vnpy_v4.4.0"))
+if _VNPY_SRC not in sys.path:
+    sys.path.insert(0, _VNPY_SRC)
+
+from vnpy.alpha.dataset.utility import DataProxy, EXPRESSION_FUNCTIONS
+
+from . import composite_library
+from .registry import register_factor, get_factor, _REGISTRY
+
+# size 中性化变量 = 总市值(close × share_capital,与 fundamental_library 估值族同式)
+SIZE_EXPRESSION = "close * share_capital"
+_NEU_SUFFIX = "_neu"
+_MIN_SAMPLES = 3  # 当日有效配对样本 <3 无截面回归意义 → 残差 null
+
+
+def cs_neutralize(feature_y: DataProxy, feature_x: DataProxy) -> DataProxy:
+    """逐日截面 OLS 残差: resid = y − a − b·x(b=cov/var, a=mean_y−b·mean_x).
+
+    纯 polars over("datetime") 聚合代数(组统计量广播回行,无逐组循环);
+    配对掩码: x 或 y null 的行不进回归统计且自身残差 null.
+    """
+    # 两操作数源自同一父 df 且全算子保长保序(fast_ts_corr 同前提)——
+    # 按位拼接等价于按键 join,免大表 hash join
+    h_y, h_x = feature_y.df.height, feature_x.df.height
+    if h_y != h_x:
+        raise ValueError(f"cs_neutralize 操作数长度不一致: {h_y} vs {h_x}(行序对齐前提被破坏)")
+    df = feature_y.df.with_columns(feature_x.df["data"].alias("data_x"))
+
+    y, x = pl.col("data"), pl.col("data_x")
+    pair = y.is_not_null() & x.is_not_null()
+    ym = pl.when(pair).then(y)  # 配对掩码后仅有效对进统计(null 自动被 mean 跳过)
+    xm = pl.when(pair).then(x)
+    n = xm.count().over("datetime")
+    mean_y = ym.mean().over("datetime")
+    mean_x = xm.mean().over("datetime")
+    var_x = (xm * xm).mean().over("datetime") - mean_x * mean_x
+    cov_xy = (xm * ym).mean().over("datetime") - mean_x * mean_y
+    slope = cov_xy / var_x
+    resid = y - (mean_y + slope * (x - mean_x))  # = y − a − b·x
+    result = pl.when((n >= _MIN_SAMPLES) & (var_x > 0)).then(resid).otherwise(None)
+
+    out = df.select(pl.col("datetime"), pl.col("vt_symbol"), result.alias("data"))
+    return DataProxy(out)
+
+
+def register_neutralize_ops() -> list[str]:
+    """注册 cs_neutralize 进 vnpy EXPRESSION_FUNCTIONS(幂等),返回算子名清单."""
+    EXPRESSION_FUNCTIONS["cs_neutralize"] = cs_neutralize
+    return ["cs_neutralize"]
+
+
+# 财务 6 源中性化版源表(方向全 "+": cs_neutralize 线性保持定向,cs_rank 后仍高=好)
+FUND_NEU_SOURCES: list[tuple[str, str]] = [
+    (f"{name}{_NEU_SUFFIX}", "+") for name, _direction in composite_library.FUND_SOURCES
+]
+
+
+def _strip_cs_rank(expression: str) -> str:
+    """剥掉外层 cs_rank(...): 'cs_rank(-nsi)' → '-nsi';非 cs_rank 包裹 raise."""
+    prefix = "cs_rank("
+    if not (expression.startswith(prefix) and expression.endswith(")")):
+        raise ValueError(f"财务源表达式非 cs_rank 包裹,无法剥壳: {expression!r}")
+    return expression[len(prefix):-1]
+
+
+def build_neutralized_expression(source_expression: str) -> str:
+    """原源注册表达式 → 市值中性化版: cs_rank((±)cs_neutralize(<原指标式>, size)).
+
+    原内层负号(如 '-nsi')移到 cs_neutralize 外成 '(-1) *'(resid(−y)=−resid(y)
+    数学等价,形态统一);正内层直接中性化.不手抄指标式,符号从入参表达式派生.
+    """
+    inner = _strip_cs_rank(source_expression)
+    if inner.startswith("-"):
+        signed = f"(-1) * cs_neutralize({inner[1:]}, {SIZE_EXPRESSION})"
+    else:
+        signed = f"cs_neutralize({inner}, {SIZE_EXPRESSION})"
+    return f"cs_rank({signed})"
+
+
+def _register_all() -> None:
+    """注册 6 个 fund_*_neu 因子(幂等,category=fundamental→合成层内嵌项口径;
+    先幂等重挂 v1.1 源,registry 被清后可独立重建)."""
+    composite_library._register_all()
+    register_neutralize_ops()
+    for src_name, _direction in composite_library.FUND_SOURCES:
+        neu_name = f"{src_name}{_NEU_SUFFIX}"
+        if neu_name in _REGISTRY:
+            continue
+        src = get_factor(src_name)
+        if src is None:
+            raise ValueError(f"中性化源因子未注册: {src_name}")
+        register_factor(neu_name, build_neutralized_expression(src["expression"]),
+                        category="fundamental")
+
+
+# 模块导入时自动注册(与 fundamental_library / composite_library 同模式);
+# cs_neutralize 同步进 EXPRESSION_FUNCTIONS,表达式字符串求值可达
+_register_all()
+
+
+__all__ = [
+    "cs_neutralize",
+    "register_neutralize_ops",
+    "FUND_NEU_SOURCES",
+    "SIZE_EXPRESSION",
+    "build_neutralized_expression",
+]
diff --git a/tests/factor/test_fundamental_neutralize.py b/tests/factor/test_fundamental_neutralize.py
new file mode 100644
index 0000000..c37ebc9
--- /dev/null
+++ b/tests/factor/test_fundamental_neutralize.py
@@ -0,0 +1,253 @@
+# tests/factor/test_fundamental_neutralize.py
+"""合成层 v2b: cs_neutralize 截面中性化算子数学等值/边界 + fund_*_neu 6 因子注册 + weighting 三源表."""
+import datetime as dt
+import json
+import os
+import sys
+
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..")))
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..", "vnpy_v4.4.0")))
+
+import polars as pl
+import pytest
+
+from vnpy.alpha.dataset.utility import DataProxy, EXPRESSION_FUNCTIONS, calculate_by_expression
+
+from sanguo_factor import composite_library, composite_weighting, fundamental_neutralize
+from sanguo_factor.fundamental_neutralize import (
+    FUND_NEU_SOURCES, SIZE_EXPRESSION, cs_neutralize, build_neutralized_expression,
+)
+from sanguo_factor.composite_weighting import WeightProfile, register_composite_from_profile
+from sanguo_factor.fundamental_library import (
+    FUNDAMENTAL_FACTORS, FUNDAMENTAL_P1_FACTORS, FUNDAMENTAL_P1B_FACTORS,
+)
+from sanguo_factor.registry import get_factor, _REGISTRY
+
+
+@pytest.fixture(autouse=True)
+def _ensure_v2b_registered():
+    """其它测试模块清空 _REGISTRY 后幂等重挂(与 test_composite_weighting 同模式)."""
+    fundamental_neutralize._register_all()
+    composite_weighting._register_all()
+
+
+def _proxy(rows: list[tuple[str, str, float | None]]) -> DataProxy:
+    """(date, symbol, value) 行列表 → DataProxy(datetime/vt_symbol/data)."""
+    df = pl.DataFrame({
+        "datetime": [dt.date.fromisoformat(d) for d, _s, _v in rows],
+        "vt_symbol": [s for _d, s, _v in rows],
+        "v": [v for _d, _s, v in rows],
+    })
+    return DataProxy(df)
+
+
+# ==================== 算子数学等值(手算 OLS) ====================
+
+def test_cs_neutralize_matches_hand_computed_ols_positive_slope():
+    """正斜率日手算: x=[1,2,3,4], y=[1,3,2,5] → b=1.1, a=0, resid=[-0.1,0.8,-1.3,0.6]."""
+    x = _proxy([("2024-01-02", f"s{i}", v) for i, v in enumerate([1.0, 2.0, 3.0, 4.0])])
+    y = _proxy([("2024-01-02", f"s{i}", v) for i, v in enumerate([1.0, 3.0, 2.0, 5.0])])
+    got = cs_neutralize(y, x).df["data"].to_list()
+    assert got == pytest.approx([-0.1, 0.8, -1.3, 0.6], abs=1e-12)
+
+
+def test_cs_neutralize_matches_hand_computed_ols_negative_slope():
+    """负斜率日手算: x=[1,2,3,4], y=[5,4,2,1] → b=-1.4, a=6.5, resid=[-0.1,0.3,-0.3,0.1]."""
+    x = _proxy([("2024-01-03", f"s{i}", v) for i, v in enumerate([1.0, 2.0, 3.0, 4.0])])
+    y = _proxy([("2024-01-03", f"s{i}", v) for i, v in enumerate([5.0, 4.0, 2.0, 1.0])])
+    got = cs_neutralize(y, x).df["data"].to_list()
+    assert got == pytest.approx([-0.1, 0.3, -0.3, 0.1], abs=1e-12)
+
+
+def test_cs_neutralize_days_are_independent():
+    """逐日独立回归: 同一调用内两日用各自斜率(拼 day1+day2,两组手算值各归各)."""
+    x = _proxy([(d, f"s{i}", v) for d, vals in (("2024-01-02", [1.0, 2.0, 3.0, 4.0]),
+                                                ("2024-01-03", [1.0, 2.0, 3.0, 4.0]))
+                for i, v in enumerate(vals)])
+    y = _proxy([(d, f"s{i}", v) for d, vals in (("2024-01-02", [1.0, 3.0, 2.0, 5.0]),
+                                                ("2024-01-03", [5.0, 4.0, 2.0, 1.0]))
+                for i, v in enumerate(vals)])
+    got = cs_neutralize(y, x).df["data"].to_list()
+    assert got == pytest.approx([-0.1, 0.8, -1.3, 0.6, -0.1, 0.3, -0.3, 0.1], abs=1e-12)
+
+
+# ==================== 算子边界 ====================
+
+def test_cs_neutralize_null_rows_propagate():
+    """null 传播: x/y 任一 null 的行残差 null;其余行按有效配对样本回归."""
+    # 5 股: 3 个有效配对(n=3 达阈值) + 1 个 y-null + 1 个 x-null
+    x = _proxy([("2024-01-02", "s0", 1.0), ("2024-01-02", "s1", 2.0), ("2024-01-02", "s2", 3.0),
+                ("2024-01-02", "s3", 4.0), ("2024-01-02", "s4", None)])
+    y = _proxy([("2024-01-02", "s0", 1.0), ("2024-01-02", "s1", 3.0), ("2024-01-02", "s2", 2.0),
+                ("2024-01-02", "s3", None), ("2024-01-02", "s4", 9.0)])
+    got = cs_neutralize(y, x).df["data"].to_list()
+    assert got[3] is None and got[4] is None        # null 行残差 null
+    # 前 3 行 = x=[1,2,3], y=[1,3,2] 的手算 OLS: b=0.5, a=1.0 → resid=[-0.5,1.0,-0.5]
+    assert got[:3] == pytest.approx([-0.5, 1.0, -0.5], abs=1e-12)
+
+
+def test_cs_neutralize_small_group_returns_null():
+    """当日有效样本 < 3 → 该日全部残差 null(含有效行)."""
+    x = _proxy([("2024-01-02", "s0", 1.0), ("2024-01-02", "s1", 2.0),
+                ("2024-01-02", "s2", None), ("2024-01-02", "s3", None)])
+    y = _proxy([("2024-01-02", "s0", 1.0), ("2024-01-02", "s1", 3.0),
+                ("2024-01-02", "s2", 7.0), ("2024-01-02", "s3", 9.0)])
+    got = cs_neutralize(y, x).df["data"].to_list()
+    assert got == [None, None, None, None]
+
+
+def test_cs_neutralize_zero_variance_returns_null():
+    """当日 var(x)=0(x 全同) → 该日全部残差 null."""
+    x = _proxy([("2024-01-02", f"s{i}", 5.0) for i in range(4)])
+    y = _proxy([("2024-01-02", f"s{i}", v) for i, v in enumerate([1.0, 2.0, 3.0, 4.0])])
+    got = cs_neutralize(y, x).df["data"].to_list()
+    assert got == [None, None, None, None]
+
+
+def test_cs_neutralize_residual_mean_zero_per_day():
+    """截面性质: 残差逐日均值 ≈ 0(OLS 回归性质)."""
+    rows_x, rows_y = [], []
+    for day, xvals, yvals in (
+        ("2024-01-02", [1.0, 2.0, 3.0, 4.0, 5.0, 6.0], [2.0, 1.5, 4.0, 3.5, 6.5, 5.0]),
+        ("2024-01-03", [10.0, 20.0, 30.0, 40.0, 50.0, 60.0], [8.0, 9.0, 2.0, 3.0, 1.0, 7.0]),
+        ("2024-01-04", [-3.0, -1.0, 0.0, 2.0, 4.0, 9.0], [5.0, -2.0, 3.0, -4.0, 1.0, 0.5]),
+    ):
+        for i, (xv, yv) in enumerate(zip(xvals, yvals)):
+            rows_x.append((day, f"s{i}", xv))
+            rows_y.append((day, f"s{i}", yv))
+    out = cs_neutralize(_proxy(rows_y), _proxy(rows_x)).df
+    per_day = out.group_by("datetime").agg(pl.col("data").mean().alias("mean_resid"))
+    for row in per_day.iter_rows(named=True):
+        assert row["mean_resid"] == pytest.approx(0.0, abs=1e-10)
+
+
+# ==================== 引擎注册与表达式求值 ====================
+
+def test_cs_neutralize_registered_in_expression_functions():
+    """沿 fast_ops 官方扩展点: cs_neutralize 已注册进 vnpy EXPRESSION_FUNCTIONS."""
+    assert EXPRESSION_FUNCTIONS.get("cs_neutralize") is cs_neutralize
+
+
+def test_cs_neutralize_evaluates_via_engine_expression():
+    """引擎端到端: calculate_by_expression('cs_neutralize(y_col, x_col)') 多参数映射列,
+    输出与直接函数调用逐点一致."""
+    df = pl.DataFrame({
+        "datetime": [dt.date(2024, 1, 2)] * 4 + [dt.date(2024, 1, 3)] * 4,
+        "vt_symbol": [f"s{i}" for i in range(4)] * 2,
+        "y_col": [1.0, 3.0, 2.0, 5.0, 5.0, 4.0, 2.0, 1.0],
+        "x_col": [1.0, 2.0, 3.0, 4.0] * 2,
+    })
+    via_engine = calculate_by_expression(df, "cs_neutralize(y_col, x_col)")
+    direct = cs_neutralize(DataProxy(df[["datetime", "vt_symbol", "y_col"]]),
+                           DataProxy(df[["datetime", "vt_symbol", "x_col"]]))
+    assert via_engine["data"].to_list() == pytest.approx(direct.df["data"].to_list(), abs=1e-12)
+
+
+# ==================== FUND_NEU_SOURCES 表与 6 因子注册 ====================
+
+def test_fund_neu_sources_table_shape():
+    """表形态: 6 项 = FUND_SOURCES 同名源加 _neu 后缀,方向全 '+'(高=好语义)."""
+    assert FUND_NEU_SOURCES == [(f"{name}_neu", "+") for name, _d in composite_library.FUND_SOURCES]
+    assert len(FUND_NEU_SOURCES) == 6
+
+
+def test_six_neu_factors_registered_with_cs_neutralize_and_size():
+    """6 个 fund_*_neu 已注册(category=fundamental),表达式含 cs_neutralize 与总市值."""
+    for neu_name, _direction in FUND_NEU_SOURCES:
+        fac = get_factor(neu_name)
+        assert fac is not None, f"{neu_name} 未注册"
+        assert fac["category"] == "fundamental"
+        assert fac["expression"].startswith("cs_rank(")
+        assert "cs_neutralize(" in fac["expression"]
+        assert SIZE_EXPRESSION in fac["expression"]
+
+
+def test_neu_sign_direction_matches_source():
+    """负号方向与原源一致: 原内层带负号(nsi/gdhs_chg)→ '(-1) * cs_neutralize(正指标)';
+    原内层无负号(bp)→ 直接 cs_neutralize.不手抄指标式,符号从注册表表达式派生."""
+    nsi = get_factor("fund_nsi_neu")["expression"]
+    assert nsi == "cs_rank((-1) * cs_neutralize(nsi, close * share_capital))"
+    gdhs = get_factor("fund_gdhs_chg_neu")["expression"]
+    assert gdhs == "cs_rank((-1) * cs_neutralize(gdhs_chg, close * share_capital))"
+    bp = get_factor("fund_bp_neu")["expression"]
+    assert bp == "cs_rank(cs_neutralize(equity / (close * share_capital), close * share_capital))"
+    # 全 6 源一致性: 符号形态从原源表达式剥壳推导,逐源核对
+    for src_name, _d in composite_library.FUND_SOURCES:
+        assert get_factor(f"{src_name}_neu")["expression"] == \
+            build_neutralized_expression(get_factor(src_name)["expression"])
+
+
+def test_original_fund_sources_unchanged():
+    """原 6 源零回归: fund_bp 等表达式与 fundamental_library 注册表逐字一致."""
+    registered = {name: expr for name, expr, _doc, _ic
+                  in [*FUNDAMENTAL_FACTORS, *FUNDAMENTAL_P1_FACTORS, *FUNDAMENTAL_P1B_FACTORS]}
+    for src_name, _d in composite_library.FUND_SOURCES:
+        assert get_factor(src_name)["expression"] == registered[src_name]
+
+
+# ==================== weighting 三源表匹配 + v2b graceful ====================
+
+def test_weighting_accepts_fund_neu_profile():
+    """纯 FUND_NEU_SOURCES 档案: 方向表匹配通过并注册,项=内嵌(已定向,不再包 cs_rank)."""
+    name = "composite_fund6_neu_test"
+    _REGISTRY.pop(name, None)
+    sources = {n: (d, 1.0) for n, d in FUND_NEU_SOURCES}
+    register_composite_from_profile(WeightProfile("t-neu", "t", "manual", sources, (), {}), name)
+    fac = get_factor(name)
+    assert fac is not None and fac["category"] == "composite"
+    assert get_factor("fund_bp_neu")["expression"] in fac["expression"]
+    assert "vma_60" not in fac["expression"]
+    _REGISTRY.pop(name, None)
+
+
+def test_weighting_accepts_combined_18_profile():
+    """QUANT+FUND_NEU 合并 18 源档案: 匹配通过,量价=rank 项+中性化=内嵌项并存."""
+    name = "composite_all18_v2b_test"
+    _REGISTRY.pop(name, None)
+    sources = {n: (d, 1.0) for n, d in composite_library.QUANT_SOURCES}
+    sources.update({n: (d, 1.0) for n, d in FUND_NEU_SOURCES})
+    register_composite_from_profile(WeightProfile("t-18", "t", "manual", sources, (), {}), name)
+    expr = get_factor(name)["expression"]
+    assert get_factor("vma_60")["expression"] in expr      # 量价源进合成
+    assert get_factor("fund_bp_neu")["expression"] in expr  # 中性化源进合成
+    _REGISTRY.pop(name, None)
+
+
+def test_weighting_rejects_mixed_direction_drift():
+    """方向漂移仍拒: 18 源档案翻转一源方向 → ValueError 且不注册(不被三选一吞掉)."""
+    name = "composite_all18_v2b_bad"
+    sources = {n: (d, 1.0) for n, d in composite_library.QUANT_SOURCES}
+    sources.update({n: (d, 1.0) for n, d in FUND_NEU_SOURCES})
+    first = next(iter(sources))
+    d, w = sources[first]
+    sources[first] = ("-" if d == "+" else "+", w)
+    with pytest.raises(ValueError, match="QUANT_SOURCES"):
+        register_composite_from_profile(
+            WeightProfile("t-bad", "t", "manual", sources, (), {}), name)
+    assert get_factor(name) is None
+
+
+def test_v2b_profile_absent_skips_registration():
+    """v2b 档案不存在(仓库当前态): _register_all 不炸、不注册 composite_all18_v2b."""
+    _REGISTRY.pop(composite_weighting._V2B_COMPOSITE_NAME, None)
+    assert not composite_weighting._V2B_PROFILE_PATH.exists()
+    composite_weighting._register_all()  # 不应 raise
+    assert get_factor(composite_weighting._V2B_COMPOSITE_NAME) is None
+
+
+def test_v2b_profile_present_registers(tmp_path, monkeypatch):
+    """v2b 档案存在(tmp 档案+monkeypatch 路径): _register_all 自动注册 composite_all18_v2b."""
+    _REGISTRY.pop(composite_weighting._V2B_COMPOSITE_NAME, None)
+    sources = {n: (d, 1.0) for n, d in composite_library.QUANT_SOURCES}
+    sources.update({n: (d, 1.0) for n, d in FUND_NEU_SOURCES})
+    profile = tmp_path / "all18_v2b_v1.json"
+    profile.write_text(json.dumps({
+        "profile_id": "all18-v2b-v1", "name": "t", "method": "manual",
+        "sources": {n: {"direction": d, "weight": w} for n, (d, w) in sources.items()},
+    }, ensure_ascii=False), encoding="utf-8")
+    monkeypatch.setattr(composite_weighting, "_V2B_PROFILE_PATH", profile)
+    composite_weighting._register_all()
+    fac = get_factor(composite_weighting._V2B_COMPOSITE_NAME)
+    assert fac is not None and fac["category"] == "composite"
+    assert get_factor("fund_bp_neu")["expression"] in fac["expression"]
+    _REGISTRY.pop(composite_weighting._V2B_COMPOSITE_NAME, None)  # 还原全局注册表
diff --git a/tests/factor/test_fundamental_p1_library.py b/tests/factor/test_fundamental_p1_library.py
index 0147a91..cfdc43c 100644
--- a/tests/factor/test_fundamental_p1_library.py
+++ b/tests/factor/test_fundamental_p1_library.py
@@ -16,6 +16,7 @@ import pytest
 from sanguo_factor import fundamental_library  # noqa: F401  import 即注册
 from sanguo_factor.fundamental_adapter import FEATURE_COLUMNS
 from sanguo_factor.fundamental_library import FUNDAMENTAL_P1_FACTORS
+from sanguo_factor.fundamental_neutralize import FUND_NEU_SOURCES  # noqa: F401  v2b 计数用
 from sanguo_factor.registry import list_factors, get_factor
 
 
@@ -100,4 +101,5 @@ def test_p1_registration_idempotent():
     """重复注册幂等(防重入)."""
     fundamental_library._register_all()
     fundamental_library._register_all()
-    assert len(list_factors("fundamental")) == 75
+    # 75 = P0 32 + P1 37 + P1-B 6;v2b 另挂 6 个 fund_*_neu(fundamental 类)
+    assert len(list_factors("fundamental")) == 75 + len(FUND_NEU_SOURCES)
diff --git a/tests/factor/test_fundamental_p1b_library.py b/tests/factor/test_fundamental_p1b_library.py
index 3058a4b..ad34fda 100644
--- a/tests/factor/test_fundamental_p1b_library.py
+++ b/tests/factor/test_fundamental_p1b_library.py
@@ -16,6 +16,7 @@ import pytest
 from sanguo_factor import fundamental_library  # noqa: F401  import 即注册
 from sanguo_factor.fundamental_adapter import FEATURE_COLUMNS
 from sanguo_factor.fundamental_library import FUNDAMENTAL_P1B_FACTORS
+from sanguo_factor.fundamental_neutralize import FUND_NEU_SOURCES  # noqa: F401  v2b 计数用
 from sanguo_factor.registry import list_factors, get_factor
 
 
@@ -68,5 +69,5 @@ def test_p1b_vb_factors_consume_vb_columns():
 def test_p1b_registration_idempotent():
     fundamental_library._register_all()
     fundamental_library._register_all()
-    # P0 32 + P1 37 + P1-B 6 = 75
-    assert len(list_factors("fundamental")) == 75
+    # P0 32 + P1 37 + P1-B 6 = 75;v2b 另挂 6 个 fund_*_neu(fundamental 类)
+    assert len(list_factors("fundamental")) == 75 + len(FUND_NEU_SOURCES)