diff --git a/sanguo_data/datareader.py b/sanguo_data/datareader.py
index 7d10b78..a19facd 100644
--- a/sanguo_data/datareader.py
+++ b/sanguo_data/datareader.py
@@ -9,7 +9,7 @@ if _VNPY_SRC not in sys.path:
     sys.path.insert(0, _VNPY_SRC)
 
 import pandas as pd
-from datetime import datetime
+from datetime import datetime, date
 from vnpy.trader.object import BarData
 from vnpy.trader.constant import Exchange, Interval
 from vnpy.trader.setting import SETTINGS
@@ -103,3 +103,43 @@ def read_parquet_15min(symbol: str, start: str, end: str, cfg, dir_key: str = "m
                 gateway_name="DATA",
             ))
     return bars
+
+
+def read_index_daily(code: str, start: date, end: date, cfg) -> pd.DataFrame:
+    """
+    读指数日线数据（sh000300/sz000905），复用 read_parquet_daily 的年分片 parquet 路径
+
+    Args:
+        code: 指数代码，如 "sh000300"（沪深300）、"sz000905"（中证500）
+        start: 起始日期
+        end: 结束日期
+        cfg: 数据配置对象
+
+    Returns:
+        pd.DataFrame: 包含 date/open/high/low/close/volume 列的日线数据
+    """
+    daily_dir = Path(cfg.data_paths["daily_dir"])
+    start_dt = start if isinstance(start, datetime) else datetime.combine(start, datetime.min.time())
+    end_dt = end if isinstance(end, datetime) else datetime.combine(end, datetime.max.time())
+
+    dfs: list[pd.DataFrame] = []
+
+    # 按年分片读取（与 read_parquet_daily 相同路径逻辑）
+    for year in range(start_dt.year, end_dt.year + 1):
+        f = daily_dir / str(year) / f"{code}_daily.parquet"
+        if not f.exists():
+            continue
+        df = pd.read_parquet(f)
+        # 过滤日期范围
+        df["date"] = pd.to_datetime(df["date"])
+        mask = (df["date"] >= start_dt) & (df["date"] <= end_dt)
+        filtered_df = df[mask].copy()
+        if not filtered_df.empty:
+            dfs.append(filtered_df)
+
+    if dfs:
+        result = pd.concat(dfs, ignore_index=True)
+        result = result.sort_values("date")
+        return result.reset_index(drop=True)
+    else:
+        return pd.DataFrame(columns=["date", "open", "high", "low", "close", "volume"])
diff --git a/sanguo_data/index_downloader.py b/sanguo_data/index_downloader.py
new file mode 100644
index 0000000..691b13c
--- /dev/null
+++ b/sanguo_data/index_downloader.py
@@ -0,0 +1,79 @@
+"""指数数据下载器 - 下载沪深300等指数日线数据（baostock）"""
+import os
+import time
+from pathlib import Path
+from datetime import datetime
+
+
+def download_index(symbol: str, start_year: int, end_year: int, out_dir: str) -> None:
+    """
+    下载指数日线数据（baostock）
+
+    Args:
+        symbol: 指数代码，如 "sh000300"（沪深300）
+        start_year: 起始年份
+        end_year: 结束年份
+        out_dir: 输出目录（会按年切分：{out_dir}/{year}/{symbol}_daily.parquet）
+    """
+    # 入口处清除代理（直连不走代理，避免数据源封IP）
+    for key in ("http_proxy", "https_proxy", "HTTP_PROXY", "HTTPS_PROXY"):
+        os.environ.pop(key, None)
+
+    import pandas as pd
+    import baostock as bs
+
+    # 登录 baostock
+    lg = bs.login()
+    if lg.error_code != "success":
+        raise RuntimeError(f"baostock 登录失败: {lg.error_msg}")
+
+    try:
+        for year in range(start_year, end_year + 1):
+            # 按年下载
+            start_date = f"{year}-01-01"
+            end_date = f"{year}-12-31"
+
+            # baostock 用带点格式 "sh.000300"
+            bs_symbol = f"{symbol[:2]}.{symbol[2:]}"
+            rs = bs.query_history_k_data_plus(
+                bs_symbol,
+                "date,open,high,low,close,volume",
+                start_date=start_date,
+                end_date=end_date,
+                frequency="d",
+                adjustfield="3"  # 不复权
+            )
+
+            if rs.error_code != "success":
+                print(f"Warning: 下载 {symbol} {year} 失败: {rs.error_msg}")
+                continue
+
+            # 转换为 DataFrame
+            data_list = []
+            while (rs.error_code == "success") and rs.next():
+                data_list.append(rs.get_row_data())
+
+            if not data_list:
+                print(f"Warning: {symbol} {year} 无数据")
+                continue
+
+            df = pd.DataFrame(data_list, columns=rs.fields)
+            df["date"] = pd.to_datetime(df["date"])
+
+            # 数值列转换
+            for col in ["open", "high", "low", "close", "volume"]:
+                df[col] = pd.to_numeric(df[col], errors="coerce")
+
+            # 按年分片写入 parquet（与现有股票日线同路径格式）
+            year_dir = Path(out_dir) / str(year)
+            year_dir.mkdir(parents=True, exist_ok=True)
+            output_file = year_dir / f"{symbol}_daily.parquet"
+            df.to_parquet(output_file, index=False)
+            print(f"已下载 {symbol} {year}: {len(df)} 行 → {output_file}")
+
+            # 单线程限速（避免数据源封IP）
+            time.sleep(0.5)
+
+    finally:
+        # 登出 baostock
+        bs.logout()