diff --git a/tools/infer/predict_rec.py b/tools/infer/predict_rec.py
index 4c16f929352640f2b770fe2ff94fd4497f1308f5..d700b5c0f0f521bfcbe7440b711b0c2f11cddf50 100755
--- a/tools/infer/predict_rec.py
+++ b/tools/infer/predict_rec.py
@@ -89,6 +89,7 @@ class TextRecognizer(object):
         imgC, imgH, imgW = self.rec_image_shape
         assert imgC == img.shape[2]
         if self.character_type == "ch":
+            max_wh_ratio = max(max_wh_ratio, imgW / imgH)
             imgW = int((32 * max_wh_ratio))
         h, w = img.shape[:2]
         ratio = w / float(h)