diff --git a/qlib/data/cache.py b/qlib/data/cache.py
index 3fab2b527..027ef89ef 100644
--- a/qlib/data/cache.py
+++ b/qlib/data/cache.py
@@ -32,7 +32,7 @@ from ..utils import (
 from ..log import get_module_logger
 from .base import Feature
 
-from .ops import *
+from .ops import Operators
 
 
 class QlibCacheException(RuntimeError):
diff --git a/qlib/data/data.py b/qlib/data/data.py
index a4c3d63f2..c142b6b26 100644
--- a/qlib/data/data.py
+++ b/qlib/data/data.py
@@ -20,7 +20,7 @@ from multiprocessing import Pool
 
 from .cache import H
 from ..config import C
-from .ops import *
+from .ops import Operators
 from ..log import get_module_logger
 from ..utils import parse_field, read_bin, hash_args, normalize_cache_fields
 from .base import Feature