diff --git a/deploy/python/preprocess.py b/deploy/python/preprocess.py
index 5e42851f1557d1c95d6622e7e82c76b9cf8a1f60..c5b5e7cd078eb998cb9913055401785a5eb122f0 100644
--- a/deploy/python/preprocess.py
+++ b/deploy/python/preprocess.py
@@ -100,6 +100,8 @@ class UnifiedResize(object):
         elif backend.lower() == "pil":
             if isinstance(interpolation, str):
                 interpolation = _pil_interp_from_str[interpolation.lower()]
+            elif interpolation is None:
+                interpolation = Image.BILINEAR
             self.resize_func = partial(
                 _pil_resize, resample=interpolation, return_numpy=return_numpy)
         else:
diff --git a/ppcls/data/preprocess/ops/operators.py b/ppcls/data/preprocess/ops/operators.py
index e290223c8a4fcf15bf3b93ae4eb7134dd1339521..0d6653a889da526ca52920fbe12e1ecbaf77530e 100644
--- a/ppcls/data/preprocess/ops/operators.py
+++ b/ppcls/data/preprocess/ops/operators.py
@@ -99,6 +99,8 @@ class UnifiedResize(object):
         elif backend.lower() == "pil":
             if isinstance(interpolation, str):
                 interpolation = _pil_interp_from_str[interpolation.lower()]
+            elif interpolation is None:
+                interpolation = Image.BILINEAR
             self.resize_func = partial(
                 _pil_resize, resample=interpolation, return_numpy=return_numpy)
         else: