diff --git a/ppdet/data/transform/operators.py b/ppdet/data/transform/operators.py
index ba08c351e8b4f657dfe3f3173644ac1f785c7c38..01890a84d1df0f16533c0b398a408e8bdb029c85 100644
--- a/ppdet/data/transform/operators.py
+++ b/ppdet/data/transform/operators.py
@@ -824,7 +824,7 @@ class Resize(BaseOperator):
             im_scale_x = resize_w / im_shape[1]
 
         im = self.apply_image(sample['image'], [im_scale_x, im_scale_y])
-        sample['image'] = im
+        sample['image'] = im.astype(np.float32)
         sample['im_shape'] = np.asarray([resize_h, resize_w], dtype=np.float32)
         if 'scale_factor' in sample:
             scale_factor = sample['scale_factor']