diff --git a/configs/rec/PP-OCRv4/ch_PP-OCRv4_rec_distillation.yml b/configs/rec/PP-OCRv4/ch_PP-OCRv4_rec_distillation.yml
index f613ee52b..aa2a36dca 100644
--- a/configs/rec/PP-OCRv4/ch_PP-OCRv4_rec_distillation.yml
+++ b/configs/rec/PP-OCRv4/ch_PP-OCRv4_rec_distillation.yml
@@ -16,7 +16,7 @@ Global:
   use_visualdl: false
   infer_img: doc/imgs_words/ch/word_1.jpg
   character_dict_path: ppocr/utils/ppocr_keys_v1.txt
-  max_text_length: 25
+  max_text_length: &max_text_length 25
   infer_mode: false
   use_space_char: true
   distributed: true