diff --git a/data_platform/realtime.py b/data_platform/realtime.py
new file mode 100644
index 00000000..29152ee8
--- /dev/null
+++ b/data_platform/realtime.py
@@ -0,0 +1,159 @@
+#!/usr/bin/env python3
+"""实时行情三源降级 - 新浪→东财→腾讯"""
+import urllib.request
+import json
+import re
+import logging
+from datetime import datetime
+from typing import Optional
+
+logging.basicConfig(level=logging.INFO, format='%(asctime)s %(levelname)s %(message)s')
+logger = logging.getLogger(__name__)
+
+HEADERS_SINA = {
+    "User-Agent": "Mozilla/5.0", "Referer": "https://finance.sina.com.cn",
+    "Accept-Language": "zh-CN,zh;q=0.9"
+}
+HEADERS_EM = {"Referer": "https://www.eastmoney.com"}
+FETCHED_AT = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
+
+
+def _fetch_url(url: str, headers: dict = None, timeout: int = 10) -> str:
+    req = urllib.request.Request(url, headers=headers or {})
+    try:
+        with urllib.request.urlopen(req, timeout=timeout) as r:
+            charset = "gbk" if "sina" in url or "sinajs" in url else "utf-8"
+            return r.read().decode(charset, errors="replace")
+    except Exception:
+        return ""
+
+
+def _parse_sina(raw: str, symbol: str) -> Optional[dict]:
+    m = re.search(r'"([^"]*)"', raw)
+    if not m:
+        return None
+    parts = m.group(1).split(",")
+    if len(parts) < 32:
+        return None
+    try:
+        prev_close = float(parts[2]) if parts[2] else 0
+        current = float(parts[3]) if parts[3] else 0
+        return {
+            "symbol": symbol, "name": parts[0],
+            "current": round(current, 2), "prev_close": round(prev_close, 2),
+            "open": round(float(parts[1]), 2) if parts[1] else 0,
+            "high": round(float(parts[4]), 2) if parts[4] else 0,
+            "low": round(float(parts[5]), 2) if parts[5] else 0,
+            "volume": int(float(parts[8])) if parts[8] else 0,
+            "amount": round(float(parts[9]), 2) if parts[9] else 0,
+            "timestamp": f"{parts[30]} {parts[31]}" if len(parts) > 31 else "",
+            "source": "sina", "fetched_at": FETCHED_AT,
+        }
+    except (ValueError, IndexError):
+        return None
+
+
+def _parse_tencent(raw: str, symbol: str) -> Optional[dict]:
+    m = re.search(r'"([^"]*)"', raw)
+    if not m:
+        return None
+    fields = m.group(1).split("~")
+    if len(fields) < 35:
+        return None
+    try:
+        current = float(fields[3])
+        prev_close = float(fields[4])
+        if current <= 0:
+            return None
+        return {
+            "symbol": symbol, "name": fields[1],
+            "current": round(current, 2), "prev_close": round(prev_close, 2),
+            "open": round(float(fields[5]), 2),
+            "high": round(float(fields[33]), 2) if fields[33] else 0,
+            "low": round(float(fields[34]), 2) if fields[34] else 0,
+            "volume": int(float(fields[6])) if fields[6] else 0,
+            "amount": round(float(fields[37]) * 10000, 2) if fields[37] else 0,
+            "timestamp": fields[30][:8] + " " + fields[30][8:] if fields[30] else "",
+            "source": "tencent", "fetched_at": FETCHED_AT,
+        }
+    except (ValueError, IndexError):
+        return None
+
+
+def _parse_eastmoney(raw: str, symbol: str) -> Optional[dict]:
+    try:
+        obj = json.loads(raw)
+        d = obj.get("data", {}) or {}
+        if not d.get("f43"):
+            return None
+        return {
+            "symbol": symbol, "name": d.get("f58", ""),
+            "current": round(d["f43"] / 100, 2),
+            "prev_close": round(d["f60"] / 100, 2),
+            "open": round(d["f46"] / 100, 2),
+            "high": round(d["f44"] / 100, 2),
+            "low": round(d["f45"] / 100, 2),
+            "volume": d.get("f47", 0),
+            "amount": round(d.get("f48", 0) / 1e8, 2),
+            "timestamp": "",
+            "source": "eastmoney", "fetched_at": FETCHED_AT,
+        }
+    except Exception:
+        return None
+
+
+def _get_prefix(code: str) -> str:
+    code = re.sub(r"[^0-9]", "", code)
+    if code.startswith(("60", "68", "51", "58", "11")):
+        return "sh", code
+    return "sz", code
+
+
+def _em_secid(code: str) -> str:
+    code = re.sub(r"[^0-9]", "", code)
+    m = 1 if code.startswith(("60", "68")) else 0
+    return f"{m}.{code}"
+
+
+def get_realtime_quote(code: str) -> dict:
+    """获取实时行情，三源降级：新浪→东财→腾讯"""
+    prefix, clean = _get_prefix(code)
+    symbol = f"{prefix}{clean}"
+
+    # 1. 新浪
+    raw = _fetch_url(f"http://hq.sinajs.cn/list={symbol}", HEADERS_SINA)
+    if raw:
+        data = _parse_sina(raw, symbol)
+        if data and data["current"] > 0:
+            logger.info(f"新浪成功: {symbol} = {data['current']}")
+            return data
+
+    # 2. 东财
+    secid = _em_secid(code)
+    raw = _fetch_url(
+        f"http://push2.eastmoney.com/api/qt/stock/get?secid={secid}"
+        f"&fields=f43,f44,f45,f46,f47,f48,f57,f58,f60,f169,f170",
+        HEADERS_EM)
+    if raw:
+        data = _parse_eastmoney(raw, symbol)
+        if data and data["current"] > 0:
+            logger.info(f"东财成功: {symbol} = {data['current']}")
+            return data
+
+    # 3. 腾讯
+    raw = _fetch_url(f"http://qt.gtimg.cn/q={symbol}")
+    if raw:
+        data = _parse_tencent(raw, symbol)
+        if data and data["current"] > 0:
+            logger.info(f"腾讯成功: {symbol} = {data['current']}")
+            return data
+
+    return {"error": f"所有数据源均无法获取 {code}", "symbol": symbol, "fetched_at": FETCHED_AT}
+
+
+if __name__ == "__main__":
+    import sys
+    code = sys.argv[1] if len(sys.argv) > 1 else "600519"
+    result = get_realtime_quote(code)
+    for k, v in result.items():
+        print(f"  {k}: {v}")