diff --git a/ppocr/utils/e2e_metric/Deteval.py b/ppocr/utils/e2e_metric/Deteval.py
index 387b3c24e6aa78fc2a7b4e03d5c133c3c6c61112..c2a4383eed38acc4e4c7effea2aa688007a0c24a 100755
--- a/ppocr/utils/e2e_metric/Deteval.py
+++ b/ppocr/utils/e2e_metric/Deteval.py
@@ -17,8 +17,6 @@ import numpy as np
 import scipy.io as io
 
 from ppocr.utils.utility import check_install
-check_install("Polygon", "Polygon3")
-import Polygon as plg
 
 from ppocr.utils.e2e_metric.polygon_fast import iod, area_of_intersection, area
 
@@ -279,6 +277,8 @@ def get_score_C(gt_label, text, pred_bboxes):
     """
     get score for CentripetalText (CT) prediction.
     """
+    check_install("Polygon", "Polygon3")
+    import Polygon as plg
 
     def gt_reading_mod(gt_label, text):
         """This helper reads groundtruths from mat files"""