diff --git a/backend/app/crypto_agent/crypto_agent.py b/backend/app/crypto_agent/crypto_agent.py
index 9fa0e4e..150a7f8 100644
--- a/backend/app/crypto_agent/crypto_agent.py
+++ b/backend/app/crypto_agent/crypto_agent.py
@@ -20,8 +20,22 @@ from app.crypto_agent.llm_signal_analyzer import LLMSignalAnalyzer
 class CryptoAgent:
     """加密货币交易信号智能体（LLM 驱动版）"""
 
+    _instance = None
+    _initialized = False
+
+    def __new__(cls, *args, **kwargs):
+        """单例模式 - 确保只有一个实例"""
+        if cls._instance is None:
+            cls._instance = super().__new__(cls)
+        return cls._instance
+
     def __init__(self):
         """初始化智能体"""
+        # 防止重复初始化
+        if CryptoAgent._initialized:
+            return
+
+        CryptoAgent._initialized = True
         self.settings = get_settings()
         self.binance = binance_service
         self.feishu = get_feishu_service()
@@ -647,5 +661,13 @@ class CryptoAgent:
         }
 
 
-# 全局实例
-crypto_agent = CryptoAgent()
+# 全局单例
+_crypto_agent: Optional['CryptoAgent'] = None
+
+
+def get_crypto_agent() -> 'CryptoAgent':
+    """获取加密货币智能体单例"""
+    global _crypto_agent
+    if _crypto_agent is None:
+        _crypto_agent = CryptoAgent()
+    return _crypto_agent
diff --git a/backend/app/main.py b/backend/app/main.py
index 3d44239..321849f 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -194,9 +194,14 @@ async def lifespan(app: FastAPI):
     # 启动加密货币智能体
     if getattr(settings, 'crypto_symbols', '') and settings.crypto_symbols.strip():
         try:
-            from app.crypto_agent.crypto_agent import crypto_agent
-            _crypto_agent_task = asyncio.create_task(crypto_agent.run())
-            logger.info(f"加密货币智能体已启动，监控: {settings.crypto_symbols}")
+            from app.crypto_agent.crypto_agent import get_crypto_agent
+            crypto_agent = get_crypto_agent()
+            # 防止重复启动
+            if not crypto_agent.running:
+                _crypto_agent_task = asyncio.create_task(crypto_agent.run())
+                logger.info(f"加密货币智能体已启动，监控: {settings.crypto_symbols}")
+            else:
+                logger.info("加密货币智能体已在运行中")
         except Exception as e:
             logger.error(f"加密货币智能体启动失败: {e}")
 
diff --git a/backend/run_crypto_agent.py b/backend/run_crypto_agent.py
index 66fac18..c3e4e6a 100644
--- a/backend/run_crypto_agent.py
+++ b/backend/run_crypto_agent.py
@@ -9,7 +9,7 @@ import os
 # 添加项目路径
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
-from app.crypto_agent.crypto_agent import crypto_agent
+from app.crypto_agent.crypto_agent import get_crypto_agent
 from app.utils.logger import logger
 
 
@@ -20,6 +20,7 @@ async def main():
     logger.info("=" * 50)
 
     try:
+        crypto_agent = get_crypto_agent()
         await crypto_agent.run()
     except KeyboardInterrupt:
         logger.info("收到停止信号，正在关闭...")