diff --git a/src/loader/DDBPITLoader.py b/src/loader/DDBPITLoader.py
index c8f8c30..099d043 100644
--- a/src/loader/DDBPITLoader.py
+++ b/src/loader/DDBPITLoader.py
@@ -14,7 +14,7 @@ import dolphindb.settings as keys
 
 import sqlalchemy as sa
 
-from DDBLoader import DDBLoader
+from .DDBLoader import DDBLoader
 
 
 class DDBPITLoader(DDBLoader):
diff --git a/src/run.py b/src/run.py
index a7f1d2d..fa8c8a5 100644
--- a/src/run.py
+++ b/src/run.py
@@ -1,4 +1,5 @@
 
+from loader.DDBPITLoader import DDBPITLoader
 from loader.DDBHFTLoader import DDBHFTLoader
 from loader.DDBBasicInfoLoader import DDBBasicInfoLoader