diff --git a/ppocr/data/simple_dataset.py b/ppocr/data/simple_dataset.py
index 10b6b7a891f99edfac3e824458238848a2ab5b51..13f9411e29430843bb808aede15e8305dbc2d028 100644
--- a/ppocr/data/simple_dataset.py
+++ b/ppocr/data/simple_dataset.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 import numpy as np
 import os
+import json
 import random
 import traceback
 from paddle.io import Dataset