diff --git a/data_platform/catalog.py b/data_platform/catalog.py
new file mode 100644
index 000000000..35c576108
--- /dev/null
+++ b/data_platform/catalog.py
@@ -0,0 +1,206 @@
+"""
+DataCatalog - 统一数据访问接口
+
+策略开发者只需通过 DataCatalog 获取数据，
+无需关心底层文件路径和存储格式。
+
+4个核心API：
+- get_daily()        获取单只股票日线行情
+- get_stock_list()   获取股票基础信息/指数成分股
+- get_test_data()    获取标准测试数据集
+- list_available()   查看可用的数据资产
+"""
+
+import os
+import logging
+from pathlib import Path
+from typing import Optional, List
+
+import pandas as pd
+
+from data_platform.config import DataPlatformConfig
+
+logger = logging.getLogger(__name__)
+
+
+class DataCatalog:
+    """
+    统一数据目录 —— 项目唯一数据入口
+
+    Usage:
+        from data_platform import DataCatalog
+
+        cat = DataCatalog()
+        df = cat.get_daily("600519", start="20250101", end="20260101")
+        stocks = cat.get_stock_list()
+    """
+
+    def __init__(self, project_root: Optional[str] = None):
+        self.config = DataPlatformConfig(project_root)
+
+    # ------------------------------------------------------------------
+    # F1: get_daily — 单只股票日线行情
+    # ------------------------------------------------------------------
+
+    def get_daily(
+        self,
+        code: str,
+        start: Optional[str] = None,
+        end: Optional[str] = None,
+        years: Optional[List[int]] = None,
+    ) -> pd.DataFrame:
+        """
+        获取单只股票日线行情（从本地 Parquet 读取）
+
+        Args:
+            code: 6位股票代码，如 "600519"
+            start: 起始日期 "YYYYMMDD"
+            end: 结束日期 "YYYYMMDD"
+            years: 指定年份列表，如 [2024, 2025]；默认自动推断
+
+        Returns:
+            DataFrame，列: date, open, high, low, close, volume, amount, ...
+        """
+        code = str(code).strip().zfill(6)
+        prefix = "sh" if code.startswith("6") else "sz"
+        pattern = f"{prefix}{code}_daily.parquet"
+
+        # 确定要扫描的年份
+        if years is None:
+            scan_years = self._detect_years()
+        else:
+            scan_years = years
+
+        frames = []
+        for year in sorted(scan_years):
+            fp = self.config.daily_parquet_dir / str(year) / pattern
+            if fp.exists():
+                frames.append(pd.read_parquet(fp))
+
+        if not frames:
+            raise FileNotFoundError(
+                f"未找到股票 {code} 的日线数据，扫描年份: {scan_years}"
+            )
+
+        df = pd.concat(frames, ignore_index=True)
+        df["date"] = pd.to_datetime(df["date"])
+        df = df.sort_values("date").reset_index(drop=True)
+
+        # 日期过滤
+        if start:
+            df = df[df["date"] >= pd.Timestamp(start)]
+        if end:
+            df = df[df["date"] <= pd.Timestamp(end)]
+
+        return df
+
+    # ------------------------------------------------------------------
+    # F1: get_stock_list — 股票列表 / 指数成分股
+    # ------------------------------------------------------------------
+
+    def get_stock_list(self, index: Optional[str] = None) -> pd.DataFrame:
+        """
+        获取股票基础信息或指数成分股
+
+        Args:
+            index: 指数代码，如 "hs300"；None 返回全部 A 股基础信息
+
+        Returns:
+            DataFrame
+        """
+        if index == "hs300":
+            fp = self.config.stock_info_dir / "hs300_constituents_latest.csv"
+            if not fp.exists():
+                raise FileNotFoundError(f"沪深300成分股文件不存在: {fp}")
+            return pd.read_csv(fp)
+
+        # 全部 A 股基础信息 —— 找最新的 stock_basic_info 文件
+        info_dir = self.config.stock_info_dir
+        candidates = sorted(info_dir.glob("stock_basic_info_raw_*.csv"))
+        if not candidates:
+            raise FileNotFoundError(f"未找到股票基础信息文件: {info_dir}")
+        return pd.read_csv(candidates[-1])
+
+    # ------------------------------------------------------------------
+    # F1: get_test_data — 标准测试数据集
+    # ------------------------------------------------------------------
+
+    def get_test_data(self, name: str) -> pd.DataFrame:
+        """
+        获取标准测试数据集
+
+        Args:
+            name: 数据集名称，如 "600519" 或 "贵州茅台"
+
+        Returns:
+            DataFrame
+
+        Example:
+            cat.get_test_data("600519")  # 茅台252日数据
+        """
+        test_dir = self.config.test_datasets_dir
+        if not test_dir.exists():
+            raise FileNotFoundError(f"测试数据集目录不存在: {test_dir}")
+
+        # 模糊匹配：文件名包含 code 或 名称
+        for fp in test_dir.glob("*.csv"):
+            if name in fp.stem:
+                return pd.read_csv(fp, parse_dates=["date"])
+
+        raise FileNotFoundError(
+            f"未找到测试数据集 '{name}'，可用: "
+            f"{[f.stem for f in test_dir.glob('*.csv')]}"
+        )
+
+    # ------------------------------------------------------------------
+    # F2: list_available — 查看可用数据资产
+    # ------------------------------------------------------------------
+
+    def list_available(self) -> dict:
+        """
+        列出所有可用数据资产
+
+        Returns:
+            dict，按类别列出数据概况
+        """
+        result = {}
+
+        # 日线行情
+        daily_dir = self.config.daily_parquet_dir
+        if daily_dir.exists():
+            years = sorted(
+                [d.name for d in daily_dir.iterdir() if d.is_dir() and d.name.isdigit()]
+            )
+            result["daily_parquet"] = {
+                "years": years,
+                "path": str(daily_dir),
+            }
+
+        # 股票信息
+        info_dir = self.config.stock_info_dir
+        if info_dir.exists():
+            files = [f.name for f in info_dir.iterdir() if f.is_file()]
+            result["stock_info"] = {"files": files, "path": str(info_dir)}
+
+        # 测试数据
+        test_dir = self.config.test_datasets_dir
+        if test_dir.exists():
+            datasets = [f.stem for f in test_dir.glob("*.csv")]
+            result["test_datasets"] = {"datasets": datasets, "path": str(test_dir)}
+
+        return result
+
+    # ------------------------------------------------------------------
+    # 内部工具
+    # ------------------------------------------------------------------
+
+    def _detect_years(self) -> List[int]:
+        """自动检测可用的年份目录"""
+        daily_dir = self.config.daily_parquet_dir
+        if not daily_dir.exists():
+            return [2024, 2025]  # 合理兜底
+        return sorted(
+            int(d.name)
+            for d in daily_dir.iterdir()
+            if d.is_dir() and d.name.isdigit()
+        )