diff --git a/backend/app/config.py b/backend/app/config.py
index 6814a3a..8ec6501 100644
--- a/backend/app/config.py
+++ b/backend/app/config.py
@@ -175,7 +175,7 @@ class Settings(BaseSettings):
 
     # 股票智能体配置
     stock_symbols_us: str = ""  # 美股代码，逗号分隔
-    # 港股代码：科技+新能源+芯片+AI+金融+汽车+医药+消费+能源
+    # 港股代码：科技+新能源+芯片+AI+金融+汽车+医药+消费+能源（统一格式：去掉前导零）
     # 科技：腾讯控股/阿里巴巴/美团/小米集团/京东集团/网易/百度/快手/知乎/B站
     # 新能源：比亚迪/理想汽车/小鹏汽车/赣锋锂业/龙源电力/信义能源
     # 芯片：中芯国际/华虹半导体/上海复旦
@@ -185,7 +185,7 @@ class Settings(BaseSettings):
     # 医药：药明康德/药明生物/百济神州/信达生物/石药集团
     # 消费：名创优品/泡泡玛特/安踏体育
     # 能源：中海油/中石油/中国神华
-    stock_symbols_hk: str = "00700.HK,09988.HK,03690.HK,01810.HK,09618.HK,09999.HK,09888.HK,01024.HK,02390.HK,09626.HK,01211.HK,02015.HK,09868.HK,01772.HK,00916.HK,03868.HK,00981.HK,01347.HK,01385.HK,00020.HK,06682.HK,02121.HK,01357.HK,09959.HK,06608.HK,00005.HK,00939.HK,01398.HK,01288.HK,03988.HK,01299.HK,02318.HK,02628.HK,03908.HK,06030.HK,09866.HK,02333.HK,00175.HK,02359.HK,02269.HK,06160.HK,01801.HK,01093.HK,09896.HK,09992.HK,02020.HK,00883.HK,00857.HK,01088.HK"
+    stock_symbols_hk: str = "700.HK,9988.HK,3690.HK,1810.HK,9618.HK,9999.HK,9888.HK,1024.HK,2390.HK,9626.HK,1211.HK,2015.HK,9868.HK,1772.HK,916.HK,3868.HK,981.HK,1347.HK,1385.HK,20.HK,6682.HK,2121.HK,1357.HK,9959.HK,6608.HK,5.HK,939.HK,1398.HK,1288.HK,3988.HK,1299.HK,2318.HK,2628.HK,3908.HK,6030.HK,9866.HK,2333.HK,175.HK,2359.HK,2269.HK,6160.HK,1801.HK,1093.HK,9896.HK,9992.HK,2020.HK,883.HK,857.HK,1088.HK"
     stock_analysis_interval: int = 300  # 分析间隔（秒，默认5分钟）
     stock_llm_threshold: float = 0.70  # 触发 LLM 分析的置信度阈值
 
diff --git a/backend/app/services/fundamental_service.py b/backend/app/services/fundamental_service.py
index 6d2b662..6ff10d5 100644
--- a/backend/app/services/fundamental_service.py
+++ b/backend/app/services/fundamental_service.py
@@ -30,6 +30,33 @@ class FundamentalService:
 
         logger.info("基本面数据服务初始化成功")
 
+    @staticmethod
+    def _normalize_hk_symbol(symbol: str) -> str:
+        """
+        标准化港股代码格式为 yfinance 要求的格式
+        - 4位及以下：左侧补零到4位，如 700.HK → 0700.HK, 5.HK → 0005.HK
+        - 5位及以上：去掉前导零，如 09618.HK → 9618.HK
+        """
+        if not symbol.endswith('.HK'):
+            return symbol
+
+        # 分离代码和后缀
+        code_part = symbol[:-3]  # 去掉 .HK
+        suffix = '.HK'
+
+        # 如果是纯数字代码
+        if code_part.isdigit():
+            # 4位及以下：补零到4位
+            if len(code_part) <= 4:
+                normalized_code = code_part.zfill(4)
+            # 5位及以上：去掉前导零
+            else:
+                normalized_code = code_part.lstrip('0') or '0'
+        else:
+            normalized_code = code_part
+
+        return normalized_code + suffix
+
     def get_fundamental_data(self, symbol: str) -> Optional[Dict[str, Any]]:
         """
         获取股票的基本面数据
@@ -44,7 +71,10 @@ class FundamentalService:
             return None
 
         try:
-            ticker = yf.Ticker(symbol)
+            # 标准化港股代码格式
+            normalized_symbol = self._normalize_hk_symbol(symbol)
+
+            ticker = yf.Ticker(normalized_symbol)
 
             # 获取股票信息
             info = ticker.info
diff --git a/backend/app/services/us_stock_service.py b/backend/app/services/us_stock_service.py
index d26eaae..8753a75 100644
--- a/backend/app/services/us_stock_service.py
+++ b/backend/app/services/us_stock_service.py
@@ -9,24 +9,54 @@ from app.utils.logger import logger
 
 
 class USStockService:
-    """美股数据服务类"""
+    """美股数据服务类（支持美股和港股）"""
 
     def __init__(self):
         """初始化美股数据服务"""
         self.cache = {}  # 简单的内存缓存
 
+    @staticmethod
+    def _normalize_hk_symbol(symbol: str) -> str:
+        """
+        标准化港股代码格式为 yfinance 要求的格式
+        - 4位及以下：左侧补零到4位，如 700.HK → 0700.HK, 5.HK → 0005.HK
+        - 5位及以上：去掉前导零，如 09618.HK → 9618.HK
+        """
+        if not symbol.endswith('.HK'):
+            return symbol
+
+        # 分离代码和后缀
+        code_part = symbol[:-3]  # 去掉 .HK
+        suffix = '.HK'
+
+        # 如果是纯数字代码
+        if code_part.isdigit():
+            # 4位及以下：补零到4位
+            if len(code_part) <= 4:
+                normalized_code = code_part.zfill(4)
+            # 5位及以上：去掉前导零
+            else:
+                normalized_code = code_part.lstrip('0') or '0'
+        else:
+            normalized_code = code_part
+
+        return normalized_code + suffix
+
     def get_stock_info(self, symbol: str) -> Optional[Dict[str, Any]]:
         """
         获取美股基本信息
 
         Args:
-            symbol: 股票代码（如 AAPL, TSLA）
+            symbol: 股票代码（如 AAPL, TSLA 或 0700.HK）
 
         Returns:
             股票基本信息字典
         """
         try:
-            stock = yf.Ticker(symbol)
+            # 标准化港股代码格式
+            normalized_symbol = self._normalize_hk_symbol(symbol)
+
+            stock = yf.Ticker(normalized_symbol)
             info = stock.info
 
             if not info or 'symbol' not in info:
@@ -85,7 +115,10 @@ class USStockService:
             包含OHLCV数据的DataFrame
         """
         try:
-            stock = yf.Ticker(symbol)
+            # 标准化港股代码格式
+            normalized_symbol = self._normalize_hk_symbol(symbol)
+
+            stock = yf.Ticker(normalized_symbol)
             hist = stock.history(period=period, interval=interval)
 
             if hist.empty:
@@ -110,7 +143,10 @@ class USStockService:
             财务数据字典
         """
         try:
-            stock = yf.Ticker(symbol)
+            # 标准化港股代码格式
+            normalized_symbol = self._normalize_hk_symbol(symbol)
+
+            stock = yf.Ticker(normalized_symbol)
 
             # 获取财务报表
             financials = stock.financials
diff --git a/backend/app/services/yfinance_service.py b/backend/app/services/yfinance_service.py
index 0643c5e..65ea145 100644
--- a/backend/app/services/yfinance_service.py
+++ b/backend/app/services/yfinance_service.py
@@ -25,18 +25,47 @@ class YFinanceService:
             logger.error("yfinance 未安装，请运行: pip install yfinance")
             raise
 
+    def _normalize_hk_symbol(self, symbol: str) -> str:
+        """
+        标准化港股代码格式为 yfinance 要求的格式
+        - 4位及以下：左侧补零到4位，如 700.HK → 0700.HK, 5.HK → 0005.HK
+        - 5位及以上：去掉前导零，如 09618.HK → 9618.HK
+        """
+        if not symbol.endswith('.HK'):
+            return symbol
+
+        # 分离代码和后缀
+        code_part = symbol[:-3]  # 去掉 .HK
+        suffix = '.HK'
+
+        # 如果是纯数字代码
+        if code_part.isdigit():
+            # 4位及以下：补零到4位
+            if len(code_part) <= 4:
+                normalized_code = code_part.zfill(4)
+            # 5位及以上：去掉前导零
+            else:
+                normalized_code = code_part.lstrip('0') or '0'
+        else:
+            normalized_code = code_part
+
+        return normalized_code + suffix
+
     def get_ticker(self, symbol: str) -> Optional[Dict]:
         """
         获取股票实时行情
 
         Args:
-            symbol: 股票代码，如 'AAPL'
+            symbol: 股票代码，如 'AAPL' 或 '0700.HK'
 
         Returns:
             行情数据字典
         """
         try:
-            ticker = self.yf.Ticker(symbol)
+            # 标准化港股代码格式
+            normalized_symbol = self._normalize_hk_symbol(symbol)
+
+            ticker = self.yf.Ticker(normalized_symbol)
 
             # 使用 history 方法获取数据（更可靠，避免 429 错误）
             hist = ticker.history(period="2d", interval="1h")
@@ -112,7 +141,9 @@ class YFinanceService:
         period: str
     ) -> Optional[pd.DataFrame]:
         """获取带缓存的数据"""
-        cache_key = f"{symbol}_{interval}_{period}"
+        # 标准化港股代码格式
+        normalized_symbol = self._normalize_hk_symbol(symbol)
+        cache_key = f"{normalized_symbol}_{interval}_{period}"
         now = datetime.now()
 
         # 检查缓存
@@ -124,7 +155,7 @@ class YFinanceService:
 
         # 获取新数据
         try:
-            ticker = self.yf.Ticker(symbol)
+            ticker = self.yf.Ticker(normalized_symbol)
             df = ticker.history(period=period, interval=interval)
 
             if df.empty: