diff --git a/app/core/rainfall_manager.py b/app/core/rainfall_manager.py
index 78028f8..8cbc364 100644
--- a/app/core/rainfall_manager.py
+++ b/app/core/rainfall_manager.py
@@ -86,10 +86,10 @@ class RainfallManager:
             query_time: 查询时间
             max_id: 最大ID
         """
-        from app.repositories.rainfall_repository import rainfall_repository
-        from app.services.rainfall_grid_service import rainfall_grid_service
-
         try:
+            from app.repositories.rainfall_repository import rainfall_repository
+            from app.services.rainfall_grid_service import rainfall_grid_service
+
             self.logger.info(f"开始生成降雨栅格，查询时间: {query_time}, ID: {max_id}")
 
             # 1. 查询雨量站点数据
diff --git a/app/services/rainfall_grid_service.py b/app/services/rainfall_grid_service.py
index f84e06c..d935edf 100644
--- a/app/services/rainfall_grid_service.py
+++ b/app/services/rainfall_grid_service.py
@@ -368,8 +368,9 @@ class RainfallGridService:
             
             # 返回相对路径（相对于FILE_STORE_DIR），统一使用正斜杠
             relative_path = os.path.join(grid_dir, 'grid.png').replace('\\', '/')
-            
-            self.logger.info(f"PNG图片已保存: {png_path.replace('\\', '/')}")
+            saved_path = png_path.replace('\\', '/')
+
+            self.logger.info(f"PNG图片已保存: {saved_path}")
             return relative_path
             
         except Exception as e: