diff --git a/backend/app/api/strategy.py b/backend/app/api/strategy.py
index 3706eaf..142d9c0 100644
--- a/backend/app/api/strategy.py
+++ b/backend/app/api/strategy.py
@@ -18,7 +18,7 @@ from fastapi.responses import StreamingResponse
 from pydantic import BaseModel
 
 from app.strategy import config as strategy_config
-from app.strategy.ai_generator import AIStrategyGenerator
+from app.strategy.ai_generator import AIStrategyGenerator, find_meta_assignment
 from app.strategy.engine import StrategyDef, StrategyEngine
 from app.strategy.monitor import StrategyMonitorService
 from app.strategy.prompt_builder import build_step1, build_step2
@@ -372,25 +372,10 @@ def _py_string(value: str) -> str:
 
 
 def _find_meta_dict(code: str) -> ast.Dict:
-    # 兼容两种 LLM 常见写法:
-    #   META = {...}        → ast.Assign
-    #   META: dict = {...}  → ast.AnnAssign (类型注解, 合法但旧逻辑漏匹配)
-    tree = ast.parse(code)
-    for node in ast.walk(tree):
-        value = None
-        if isinstance(node, ast.Assign):
-            for target in node.targets:
-                if isinstance(target, ast.Name) and target.id == "META":
-                    value = node.value
-                    break
-        elif isinstance(node, ast.AnnAssign) and isinstance(node.target, ast.Name) \
-                and node.target.id == "META":
-            value = node.value
-        if value is not None:
-            if not isinstance(value, ast.Dict):
-                raise ValueError("META 必须是字面量字典")
-            return value
-    raise ValueError("找不到 META 字典")
+    found = find_meta_assignment(code)
+    if found is None:
+        raise ValueError("找不到 META 字典")
+    return found[1]
 
 
 def _set_meta_string_field(block: str, field: str, value: str) -> str:
@@ -437,7 +422,22 @@ def _normalize_strategy_meta(code: str, strategy_id: str,
                              name: str | None = None,
                              description: str | None = None) -> str:
     """Force persisted strategy identity to match the caller-owned identity."""
-    meta_node = _find_meta_dict(code)
+    found = find_meta_assignment(code)
+    if found is None:
+        raise ValueError("找不到 META 字典")
+    target, meta_node = found
+    if target.id != "META":
+        lines = code.splitlines(keepends=True)
+        index = target.lineno - 1
+        raw_line = lines[index].encode("utf-8")
+        lines[index] = (
+            raw_line[:target.col_offset]
+            + b"META"
+            + raw_line[target.end_col_offset:]
+        ).decode("utf-8")
+        code = "".join(lines)
+        meta_node = _find_meta_dict(code)
+
     lines = code.splitlines(keepends=True)
     start = meta_node.lineno - 1
     end = meta_node.end_lineno or meta_node.lineno
@@ -695,6 +695,8 @@ async def build_strategy_stream(req: BuildRequest, request: Request):
                 chunks.append(chunk)
                 yield json.dumps({"type": "delta", "content": chunk}, ensure_ascii=False) + "\n"
             result = gen.validate_code("".join(chunks))
+            if gen.needs_structural_repair(result):
+                result = await gen.repair_code(result["code"], result["error"])
             if req.step == 1:
                 result = _normalize_build_result(result, req.strategy_id, req.name, req.description)
             elif req.strategy_id:
diff --git a/backend/app/backtest/matrix.py b/backend/app/backtest/matrix.py
index 2eb91f1..ef71ecd 100644
--- a/backend/app/backtest/matrix.py
+++ b/backend/app/backtest/matrix.py
@@ -25,7 +25,20 @@ import polars as pl
 import pyarrow as pa
 import pyarrow.compute as pc
 import pyarrow.dataset as pads
-from numba import njit, prange
+
+try:
+    from numba import njit, prange
+except ImportError:
+    def njit(*args, **kwargs):
+        if len(args) == 1 and callable(args[0]) and not kwargs:
+            return args[0]
+
+        def decorator(func):
+            return func
+
+        return decorator
+
+    prange = range
 
 _MATRIX_CACHE_VERSION = 1
 _DIRECT_MATRIX_LOADER_VERSION = 3
diff --git a/backend/app/services/ext_presets.py b/backend/app/services/ext_presets.py
index d3d118e..5f9ac79 100644
--- a/backend/app/services/ext_presets.py
+++ b/backend/app/services/ext_presets.py
@@ -16,6 +16,7 @@
 from __future__ import annotations
 
 import logging
+import math
 from pathlib import Path
 
 from app.services.ext_data import (
@@ -108,6 +109,13 @@ def _symbol_to_code(symbol: str) -> str:
     return symbol.split(".", 1)[0] if "." in symbol else symbol
 
 
+def _dimension_label(value: object) -> str:
+    if value is None or (isinstance(value, float) and not math.isfinite(value)):
+        return ""
+    text = str(value).strip()
+    return "" if text.casefold() in {"nan", "none", "null"} else text
+
+
 def _flatten_concept_rows(raw_rows: list[dict]) -> list[dict]:
     """概念: concepts 数组 → 分号拼接成「所属概念」字符串。
 
@@ -120,10 +128,11 @@ def _flatten_concept_rows(raw_rows: list[dict]) -> list[dict]:
         if not sym:
             continue
         concepts = r.get("concepts") or []
+        labels = [label for c in concepts if (label := _dimension_label(c))]
         out.append({
             "股票代码": sym,
             "股票简称": r.get("name") or "",
-            "所属概念": ";".join(str(c) for c in concepts if c),
+            "所属概念": ";".join(labels),
             "symbol": sym,
             "code": _symbol_to_code(sym),
         })
@@ -141,10 +150,11 @@ def _flatten_industry_rows(raw_rows: list[dict]) -> list[dict]:
         if not sym:
             continue
         inds = r.get("industries") or []
+        labels = [label for i in inds if (label := _dimension_label(i))]
         out.append({
             "股票代码": sym,
             "股票简称": r.get("name") or "",
-            "所属同花顺行业": "-".join(str(i) for i in inds if i),
+            "所属同花顺行业": "-".join(labels),
             "symbol": sym,
             "code": _symbol_to_code(sym),
         })
diff --git a/backend/app/services/market_overview_builder.py b/backend/app/services/market_overview_builder.py
index a61209a..5d7f622 100644
--- a/backend/app/services/market_overview_builder.py
+++ b/backend/app/services/market_overview_builder.py
@@ -216,7 +216,11 @@ def _read_ext_rows(data_dir, config: ExtConfig, dimension_field: str) -> list[di
 def _dimension_values(raw: Any) -> list[str]:
     if raw is None:
         return []
-    values = [v.strip() for v in _DIMENSION_SEP.split(str(raw).strip()) if v.strip()]
+    values = [
+        v.strip()
+        for v in _DIMENSION_SEP.split(str(raw).strip())
+        if v.strip() and v.strip().casefold() not in {"nan", "none", "null"}
+    ]
     return values
 
 
diff --git a/backend/app/strategy/ai_generator.py b/backend/app/strategy/ai_generator.py
index fe774bc..909d061 100644
--- a/backend/app/strategy/ai_generator.py
+++ b/backend/app/strategy/ai_generator.py
@@ -7,6 +7,7 @@ from __future__ import annotations
 
 import ast
 import logging
+import re
 from pathlib import Path
 
 logger = logging.getLogger(__name__)
@@ -29,11 +30,85 @@ _SYSTEM_PREFIX = """你是A股量化策略设计专家。根据用户描述的
 4. scoring 权重根据策略核心逻辑定制，总和 = 1.0
 5. 优先使用 Polars 表达式、窗口函数、聚合和 with_columns/filter 实现，避免逐行/逐股 Python 循环；只有表达式难以描述的复杂状态机才使用 partition_by/to_dicts
 6. 直接输出Python代码，不要输出其他内容
+7. 元数据必须使用模块顶层的 META = {...} 或 META: dict = {...}，不得省略或改名；并且必须定义所选执行后端要求的策略入口
 
 --- 策略开发指南 ---
 
 """
 
+_META_NAMES = ("META", "STRATEGY_META", "meta")
+_FENCED_CODE_RE = re.compile(
+    r"```(?P<language>[^\n`]*)\r?\n(?P<code>.*?)```",
+    re.DOTALL,
+)
+_POLARS_ENTRYPOINT_ERROR = "找不到策略入口函数 filter() 或 filter_history()"
+_MATRIX_ENTRYPOINT_ERROR = "找不到 Matrix 策略入口 MATRIX_STRATEGY"
+
+
+def _top_level_assignment(
+    tree: ast.Module,
+    name: str,
+) -> tuple[ast.Name, ast.expr | None] | None:
+    for node in tree.body:
+        if isinstance(node, ast.Assign):
+            target = next(
+                (item for item in node.targets
+                 if isinstance(item, ast.Name) and item.id == name),
+                None,
+            )
+            if target is not None:
+                return target, node.value
+        elif isinstance(node, ast.AnnAssign) \
+                and isinstance(node.target, ast.Name) \
+                and node.target.id == name:
+            return node.target, node.value
+    return None
+
+
+def find_meta_assignment(code: str) -> tuple[ast.Name, ast.Dict] | None:
+    """Find a supported module-level META assignment without executing code."""
+    tree = ast.parse(code)
+    for name in _META_NAMES:
+        found = _top_level_assignment(tree, name)
+        if found is not None:
+            target, value = found
+            if not isinstance(value, ast.Dict):
+                raise ValueError(f"{name} 必须是字面量字典")
+            return target, value
+    return None
+
+
+def _strategy_execution_backend(tree: ast.Module, meta: dict | None = None) -> str:
+    found = _top_level_assignment(tree, "EXECUTION_BACKEND")
+    if found is not None:
+        try:
+            value = ast.literal_eval(found[1])
+        except (ValueError, SyntaxError):
+            value = None
+        if isinstance(value, str):
+            return value
+    if isinstance(meta, dict) and isinstance(meta.get("execution_backend"), str):
+        return meta["execution_backend"]
+    if any(
+        isinstance(node, (ast.FunctionDef, ast.AsyncFunctionDef))
+        and node.name == "filter_history"
+        for node in tree.body
+    ):
+        return "python_history_legacy"
+    return "polars_expr"
+
+
+def _strategy_entrypoint_error(code: str, meta: dict | None = None) -> str | None:
+    tree = ast.parse(code)
+    if _strategy_execution_backend(tree, meta) == "matrix_native":
+        return None if _top_level_assignment(tree, "MATRIX_STRATEGY") else _MATRIX_ENTRYPOINT_ERROR
+    has_polars_entrypoint = any(
+        isinstance(node, (ast.FunctionDef, ast.AsyncFunctionDef))
+        and node.name in {"filter", "filter_history"}
+        for node in tree.body
+    )
+    return None if has_polars_entrypoint else _POLARS_ENTRYPOINT_ERROR
+
 
 class AIStrategyGenerator:
     """AI 策略生成器"""
@@ -59,7 +134,10 @@ class AIStrategyGenerator:
 
         # 调用 LLM
         code = await self._call_llm(user_prompt, guide)
-        return self.validate_code(code)
+        result = self.validate_code(code)
+        if self.needs_structural_repair(result):
+            return await self.repair_code(result["code"], result["error"])
+        return result
 
     async def stream(self, user_prompt: str):
         """Yield generated strategy code deltas from the configured AI provider."""
@@ -82,16 +160,84 @@ class AIStrategyGenerator:
         # 验证
         try:
             self._validate_safety(code)
+        except SyntaxError as e:
+            return {
+                "code": code,
+                "meta": {},
+                "valid": False,
+                "error": f"Python 语法错误: {e.msg}",
+            }
         except ValueError as e:
-            return {"code": code, "meta": {}, "valid": False, "error": str(e)}
+            return {
+                "code": code,
+                "meta": {},
+                "valid": False,
+                "error": str(e),
+            }
 
         # 试加载获取 META
         try:
             meta = self._extract_meta(code)
         except Exception as e:
-            return {"code": code, "meta": {}, "valid": False, "error": f"解析META失败: {e}"}
+            return {
+                "code": code,
+                "meta": {},
+                "valid": False,
+                "error": f"解析META失败: {e}",
+            }
 
-        return {"code": code, "meta": meta, "valid": True, "error": None}
+        entrypoint_error = _strategy_entrypoint_error(code, meta)
+        if entrypoint_error:
+            return {
+                "code": code,
+                "meta": meta,
+                "valid": False,
+                "error": entrypoint_error,
+            }
+
+        return {
+            "code": code,
+            "meta": meta,
+            "valid": True,
+            "error": None,
+        }
+
+    @staticmethod
+    def needs_structural_repair(result: dict) -> bool:
+        error = result.get("error") or ""
+        return error.startswith("解析META失败:") or error in {
+            _POLARS_ENTRYPOINT_ERROR,
+            _MATRIX_ENTRYPOINT_ERROR,
+        }
+
+    async def repair_code(self, code: str, error: str) -> dict:
+        """Ask the model once for a complete replacement after a structural error."""
+        try:
+            backend = _strategy_execution_backend(ast.parse(code))
+        except SyntaxError:
+            backend = "polars_expr"
+        if backend == "matrix_native":
+            entrypoint_requirement = (
+                '保留 EXECUTION_BACKEND = "matrix_native"，定义 MATRIX_STRATEGY，'
+                "不得添加 filter() 或 filter_history()"
+            )
+        else:
+            entrypoint_requirement = (
+                "保留原执行后端，并定义对应的 filter() 或 filter_history()"
+            )
+        prompt = f"""上一次生成的策略代码未通过结构校验。
+
+校验错误：{error}
+
+请输出修复后的完整策略 Python 文件。必须保留原策略意图和参数，使用模块顶层
+META = {{...}}，{entrypoint_requirement}。只输出完整 Python 代码。
+
+上一次代码：
+```python
+{code}
+```"""
+        repaired = await self._call_llm(prompt, self._get_guide())
+        return self.validate_code(repaired)
 
     async def _call_llm(self, user_prompt: str, guide: str) -> str:
         """Call the configured AI provider and return generated strategy code."""
@@ -109,11 +255,22 @@ class AIStrategyGenerator:
 
     @staticmethod
     def _extract_code_block(content: str) -> str:
-        # Extract fenced code if the model wrapped the answer in Markdown.
-        if "```python" in content:
-            return content.split("```python", 1)[1].split("```", 1)[0].strip()
-        if "```" in content:
-            return content.split("```", 1)[1].split("```", 1)[0].strip()
+        blocks = list(_FENCED_CODE_RE.finditer(content))
+        for match in blocks:
+            candidate = match.group("code").strip()
+            try:
+                found = find_meta_assignment(candidate)
+                if found is not None:
+                    meta = ast.literal_eval(found[1])
+                    if isinstance(meta, dict) and _strategy_entrypoint_error(candidate, meta) is None:
+                        return candidate
+            except (SyntaxError, ValueError):
+                continue
+        for match in blocks:
+            if match.group("language").strip().lower() in {"python", "py"}:
+                return match.group("code").strip()
+        if blocks:
+            return blocks[0].group("code").strip()
         return content.strip()
 
     # import 白名单: Polars 与矩阵策略只开放执行协议所需模块。
@@ -196,20 +353,14 @@ class AIStrategyGenerator:
         兼容两种声明: META = {...} (Assign) 和 META: dict = {...} (AnnAssign)。
         与 api.strategy._find_meta_dict 保持同一套匹配逻辑。
         """
-        tree = ast.parse(code)
-        for node in ast.walk(tree):
-            value = None
-            if isinstance(node, ast.Assign):
-                for target in node.targets:
-                    if isinstance(target, ast.Name) and target.id == "META":
-                        value = node.value
-                        break
-            elif isinstance(node, ast.AnnAssign) and isinstance(node.target, ast.Name) \
-                    and node.target.id == "META":
-                value = node.value
-            if value is not None:
-                try:
-                    return ast.literal_eval(value)
-                except (ValueError, SyntaxError) as e:
-                    raise ValueError(f"META 必须是纯字面量字典: {e}") from e
-        return {}
+        found = find_meta_assignment(code)
+        if found is None:
+            raise ValueError("找不到 META 字典")
+        _, value = found
+        try:
+            meta = ast.literal_eval(value)
+        except (ValueError, SyntaxError) as e:
+            raise ValueError(f"META 必须是纯字面量字典: {e}") from e
+        if not isinstance(meta, dict):
+            raise ValueError("META 必须是纯字面量字典")
+        return meta
diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index 42e0b9e..7b09b22 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -19,7 +19,8 @@ dependencies = [
     "pyarrow>=16.0",
     "pandas>=2.2",                # 仅在 BacktestService 边界使用,见 §7.4 / ADR-19
     "psutil>=5.9",                # 独立回测 worker 的峰值 RSS 与退出后内存指标
-    "numba>=0.65.1",              # Matrix 有效 K 线通用编译内核
+    # llvmlite 不再提供 macOS Intel wheel；该平台使用 Matrix 纯 Python fallback。
+    "numba>=0.65.1; sys_platform != 'darwin' or platform_machine != 'x86_64'",
     "fastexcel>=0.10",            # Polars 读取 xlsx/xls
     # TickFlow 官方 SDK
     "tickflow[all]>=0.1.23",
diff --git a/backend/tests/test_ai_generator_prompt.py b/backend/tests/test_ai_generator_prompt.py
index 17d82b5..9f86a42 100644
--- a/backend/tests/test_ai_generator_prompt.py
+++ b/backend/tests/test_ai_generator_prompt.py
@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+import pytest
+
 from app.strategy.ai_generator import GUIDE_PATH, AIStrategyGenerator
 from app.strategy.prompt_builder import build_step1
 
@@ -44,3 +46,21 @@ def test_matrix_backend_prompt_and_imports_are_supported():
         "import numpy as np\n"
         "from app.backtest.matrix import MarketDataMatrix, SignalMatrix, make_signal_matrix\n"
     )
+
+
+@pytest.mark.asyncio
+async def test_generate_only_repairs_structural_output_once(monkeypatch):
+    calls = 0
+
+    async def fake_call_llm(self, user_prompt, guide):
+        nonlocal calls
+        calls += 1
+        return "import polars as pl\n\ndef filter(df, params):\n    return pl.lit(True)"
+
+    monkeypatch.setattr(AIStrategyGenerator, "_call_llm", fake_call_llm)
+
+    result = await AIStrategyGenerator().generate("生成测试策略")
+
+    assert calls == 2
+    assert result["valid"] is False
+    assert "找不到 META 字典" in result["error"]
diff --git a/backend/tests/test_ai_strategy_meta_normalize.py b/backend/tests/test_ai_strategy_meta_normalize.py
index 16993e5..791a8ff 100644
--- a/backend/tests/test_ai_strategy_meta_normalize.py
+++ b/backend/tests/test_ai_strategy_meta_normalize.py
@@ -1,6 +1,8 @@
 """AI 策略 META 规范化回归测试。"""
 from __future__ import annotations
 
+import pytest
+
 from app.api.strategy import _normalize_build_result, _normalize_strategy_meta
 
 RAW_CODE = '''"""模型返回的策略"""
@@ -138,3 +140,99 @@ def test_normalize_build_result_succeeds_on_annotated_form():
     assert normalized["valid"] is True
     assert normalized["error"] is None
     assert normalized["meta"]["id"] == "ai_build_ok"
+
+
+@pytest.mark.parametrize("alias", ["STRATEGY_META", "meta"])
+def test_normalize_strategy_meta_accepts_common_aliases(alias):
+    from app.strategy.ai_generator import AIStrategyGenerator
+
+    raw = RAW_CODE.replace("META =", f"{alias} =", 1)
+
+    code = _normalize_strategy_meta(raw, "ai_alias_ok", name="别名策略")
+
+    compile(code, "<strategy>", "exec")
+    assert "META =" in code
+    assert f"{alias} =" not in code
+    assert AIStrategyGenerator._extract_meta(code)["id"] == "ai_alias_ok"
+
+
+def test_validate_code_rejects_missing_meta():
+    from app.strategy.ai_generator import AIStrategyGenerator
+
+    code = """import polars as pl
+
+def filter(df, params):
+    return pl.lit(True)
+"""
+
+    result = AIStrategyGenerator().validate_code(code)
+
+    assert result["valid"] is False
+    assert "找不到 META 字典" in result["error"]
+
+
+def test_validate_code_ignores_meta_inside_function():
+    from app.strategy.ai_generator import AIStrategyGenerator
+
+    code = """import polars as pl
+
+def filter(df, params):
+    META = {"id": "nested"}
+    return pl.lit(True)
+"""
+
+    result = AIStrategyGenerator().validate_code(code)
+
+    assert result["valid"] is False
+    assert "找不到 META 字典" in result["error"]
+
+
+def test_validate_code_rejects_missing_strategy_entrypoint():
+    from app.strategy.ai_generator import AIStrategyGenerator
+
+    result = AIStrategyGenerator().validate_code('META = {"id": "no_filter"}')
+
+    assert result["valid"] is False
+    assert result["error"] == "找不到策略入口函数 filter() 或 filter_history()"
+
+
+def test_validate_code_accepts_matrix_strategy_entrypoint():
+    from app.strategy.ai_generator import AIStrategyGenerator
+
+    code = '''META = {"id": "matrix", "execution_backend": "matrix_native"}
+EXECUTION_BACKEND = "matrix_native"
+MATRIX_STRATEGY = object()
+'''
+
+    result = AIStrategyGenerator().validate_code(code)
+
+    assert result["valid"] is True
+    assert result["error"] is None
+
+
+def test_validate_code_rejects_missing_matrix_strategy_entrypoint():
+    from app.strategy.ai_generator import AIStrategyGenerator
+
+    code = '''META = {"id": "matrix", "execution_backend": "matrix_native"}
+EXECUTION_BACKEND = "matrix_native"
+'''
+
+    result = AIStrategyGenerator().validate_code(code)
+
+    assert result["valid"] is False
+    assert result["error"] == "找不到 Matrix 策略入口 MATRIX_STRATEGY"
+
+
+def test_extract_code_block_prefers_complete_strategy():
+    from app.strategy.ai_generator import AIStrategyGenerator
+
+    content = f"""```python
+print("draft")
+```
+
+```python
+{RAW_CODE}
+```
+"""
+
+    assert AIStrategyGenerator._extract_code_block(content) == RAW_CODE.strip()
diff --git a/backend/tests/test_ext_preset_dimension_values.py b/backend/tests/test_ext_preset_dimension_values.py
new file mode 100644
index 0000000..82133a3
--- /dev/null
+++ b/backend/tests/test_ext_preset_dimension_values.py
@@ -0,0 +1,28 @@
+from __future__ import annotations
+
+from app.services.ext_presets import _flatten_concept_rows, _flatten_industry_rows
+from app.services.market_overview_builder import _dimension_values
+
+
+def test_concept_flatten_drops_missing_value_placeholders():
+    rows = _flatten_concept_rows([{
+        "symbol": "600000.SH",
+        "name": "浦发银行",
+        "concepts": ["银行", "nan", None, float("nan"), " null ", "金融科技"],
+    }])
+
+    assert rows[0]["所属概念"] == "银行;金融科技"
+
+
+def test_industry_flatten_drops_missing_value_placeholders():
+    rows = _flatten_industry_rows([{
+        "symbol": "600000.SH",
+        "name": "浦发银行",
+        "industries": ["金融", "None", "银行"],
+    }])
+
+    assert rows[0]["所属同花顺行业"] == "金融-银行"
+
+
+def test_overview_dimension_values_ignore_legacy_nan_group():
+    assert _dimension_values("人工智能;nan;芯片;NULL") == ["人工智能", "芯片"]
diff --git a/backend/tests/test_strategy_build_stream.py b/backend/tests/test_strategy_build_stream.py
index a43768d..7d1b5dc 100644
--- a/backend/tests/test_strategy_build_stream.py
+++ b/backend/tests/test_strategy_build_stream.py
@@ -7,7 +7,6 @@ import pytest
 from app.api.strategy import BuildRequest, build_strategy_stream
 from app.strategy.ai_generator import AIStrategyGenerator
 
-
 STREAM_CODE = '''"""测试策略"""
 import polars as pl
 
@@ -66,3 +65,39 @@ async def test_build_strategy_stream_yields_delta_and_normalized_result(monkeypa
     assert result["meta"]["id"] == "ai_streamed"
     assert result["meta"]["name"] == "新策略"
     assert '"id": "ai_streamed"' in result["code"]
+
+
+@pytest.mark.asyncio
+async def test_build_strategy_stream_repairs_missing_meta_once(monkeypatch):
+    calls = 0
+
+    async def fake_stream(self, prompt):
+        yield "import polars as pl\n\ndef filter(df, params):\n    return pl.lit(True)\n"
+
+    async def fake_repair(self, code, error):
+        nonlocal calls
+        calls += 1
+        return self.validate_code(STREAM_CODE)
+
+    monkeypatch.setattr(AIStrategyGenerator, "stream", fake_stream)
+    monkeypatch.setattr(AIStrategyGenerator, "repair_code", fake_repair)
+    req = BuildRequest(
+        step=1,
+        name="修复后策略",
+        description="修复后描述",
+        direction="long",
+        rules="1. 测试规则",
+        strategy_id="ai_repaired",
+    )
+
+    response = await build_strategy_stream(req, None)
+    body = b""
+    async for chunk in response.body_iterator:
+        body += chunk.encode("utf-8") if isinstance(chunk, str) else chunk
+
+    result = json.loads(body.decode("utf-8").splitlines()[-1])
+    assert calls == 1
+    assert result["type"] == "result"
+    assert result["valid"] is True
+    assert result["meta"]["id"] == "ai_repaired"
+    assert result["meta"]["name"] == "修复后策略"
diff --git a/backend/uv.lock b/backend/uv.lock
index 63d96a7..f38c899 100644
--- a/backend/uv.lock
+++ b/backend/uv.lock
@@ -2512,7 +2512,7 @@ dependencies = [
     { name = "fastapi" },
     { name = "fastexcel" },
     { name = "httpx" },
-    { name = "numba" },
+    { name = "numba", marker = "platform_machine != 'x86_64' or sys_platform != 'darwin'" },
     { name = "openai" },
     { name = "pandas" },
     { name = "pillow" },
@@ -2558,7 +2558,7 @@ requires-dist = [
     { name = "fastexcel", specifier = ">=0.10" },
     { name = "httpx", specifier = ">=0.27" },
     { name = "mypy", marker = "extra == 'dev'", specifier = ">=1.10" },
-    { name = "numba", specifier = ">=0.65.1" },
+    { name = "numba", marker = "platform_machine != 'x86_64' or sys_platform != 'darwin'", specifier = ">=0.65.1" },
     { name = "openai", specifier = ">=1.40" },
     { name = "pandas", specifier = ">=2.2" },
     { name = "pillow", specifier = ">=10.0" },
diff --git a/frontend/src/lib/analysis-adapter.ts b/frontend/src/lib/analysis-adapter.ts
index 0d7f738..ac9d9a7 100644
--- a/frontend/src/lib/analysis-adapter.ts
+++ b/frontend/src/lib/analysis-adapter.ts
@@ -56,6 +56,19 @@ const DIMENSION_NAME_KEYS = [
   'name', '概念名称', '概念', '行业名称', '行业', '板块名称', '板块',
   'concept', 'industry', 'sector', 'theme', 'title', 'label',
 ]
+const INVALID_DIMENSION_VALUES = new Set(['nan', 'none', 'null'])
+
+function dimensionValue(raw: unknown): string {
+  const text = String(raw ?? '').trim()
+  return INVALID_DIMENSION_VALUES.has(text.toLowerCase()) ? '' : text
+}
+
+function dimensionValues(raw: unknown): string[] {
+  if (raw == null) return []
+  return String(raw).split(SEPARATORS)
+    .map(dimensionValue)
+    .filter(Boolean)
+}
 
 /** 检测行是否是"板块维度"结构（含成分股列表字段） */
 function detectConstituentField(fields: ExtDataField[]): string | null {
@@ -105,13 +118,9 @@ function parsePerStock(
   const map = new Map<string, StockRow[]>()
 
   for (const row of rows) {
-    const raw = row[dimensionField]
-    if (raw == null) continue
-    const text = String(raw).trim()
-    if (!text) continue
-
     // 支持多值分隔（如 "人工智能,芯片,5G"）
-    const values = text.split(SEPARATORS).map(s => s.trim()).filter(Boolean)
+    const values = dimensionValues(row[dimensionField])
+    if (!values.length) continue
     const stock: StockRow = { ...row, symbol: row.symbol ?? row.code ?? '' }
 
     for (const v of values) {
@@ -142,7 +151,7 @@ function parsePerDimension(
   const allStocks: StockRow[] = []
 
   const groups = rows.map(row => {
-    const key = String(row[nameField] ?? row[constituentField] ?? '').trim()
+    const key = dimensionValue(row[nameField] ?? row[constituentField])
     if (!key) return null
 
     // 成分股可能是字符串数组、对象数组、逗号分隔字符串