diff --git a/paddlex/cv/nets/detection/yolo_v3.py b/paddlex/cv/nets/detection/yolo_v3.py
index c54963c54a5f57cc7b57767c34e512ad0150e2a5..dd505ff55e7c18aa7956dcaa545fba27ebc9eb5f 100644
--- a/paddlex/cv/nets/detection/yolo_v3.py
+++ b/paddlex/cv/nets/detection/yolo_v3.py
@@ -483,7 +483,6 @@ class YOLOv3:
         return inputs
 
     def build_net(self, inputs):
-        import numpy as np
         image = inputs['image']
         feats = self.backbone(image)
         if isinstance(feats, OrderedDict):