diff --git a/Dive-into-DL-paddlepaddle/docs/13-computer-vision/13.9 semantic-segmentation-and-dataset.md b/Dive-into-DL-paddlepaddle/docs/13-computer-vision/13.9 semantic-segmentation-and-dataset.md
index 3dbac5849..07a85421f 100644
--- a/Dive-into-DL-paddlepaddle/docs/13-computer-vision/13.9 semantic-segmentation-and-dataset.md	
+++ b/Dive-into-DL-paddlepaddle/docs/13-computer-vision/13.9 semantic-segmentation-and-dataset.md	
@@ -163,7 +163,8 @@ def voc_rand_crop(feature, label, height, width):
     feature = paddle.vision.transforms.crop(feature, *rect)
     label = paddle.vision.transforms.crop(label, *rect)
     return feature, label
-    
+```
+```python
 imgs = []
 for _ in range(n):
     imgs += voc_rand_crop(train_features[0], train_labels[0], 200, 300)