diff --git a/backend/main.py b/backend/main.py
index 32254d2..3eb1310 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -11,6 +11,13 @@ from dotenv import load_dotenv
 # 加载环境变量
 load_dotenv()
 
+# 配置boto3使用环境变量
+boto3.setup_default_session(
+    aws_access_key_id=os.getenv('AWS_ACCESS_KEY_ID'),
+    aws_secret_access_key=os.getenv('AWS_SECRET_ACCESS_KEY'),
+    region_name=os.getenv('AWS_DEFAULT_REGION')
+)
+
 app = FastAPI()
 
 # 配置CORS