diff --git a/app/dependencies/database.py b/app/dependencies/database.py
index c3ec9a4..1ced03c 100644
--- a/app/dependencies/database.py
+++ b/app/dependencies/database.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+from contextvars import ContextVar
 import json
 
 from app.config import settings
@@ -25,8 +26,22 @@ redis_client = redis.from_url(settings.redis_url, decode_responses=True)
 
 
 # 数据库依赖
+db_session_context: ContextVar[AsyncSession | None] = ContextVar(
+    "db_session_context", default=None
+)
+
+
 async def get_db():
-    async with AsyncSession(engine) as session:
+    session = db_session_context.get()
+    if session is None:
+        session = AsyncSession(engine)
+        db_session_context.set(session)
+        try:
+            yield session
+        finally:
+            await session.close()
+            db_session_context.set(None)
+    else:
         yield session