diff --git a/video_prediction_tools/main_scripts/main_meta_postprocess.py b/video_prediction_tools/main_scripts/main_meta_postprocess.py
index 95f6e54c86eb7c96f662f66d86b96c763af568d1..7754371ff10a2e8e651486614f0a5a62932034de 100644
--- a/video_prediction_tools/main_scripts/main_meta_postprocess.py
+++ b/video_prediction_tools/main_scripts/main_meta_postprocess.py
@@ -7,12 +7,10 @@ from __future__ import division
 from __future__ import print_function
 
 __email__ = "b.gong@fz-juelich.de"
-__author__ = "Bing Gong"
+__author__ = "Bing Gong, Yan Ji"
 __date__ = "2020-12-04"
 __update_date__ = "2022-02-02"
 
-
-import os
 from matplotlib.pylab import plt
 import json
 import numpy as np
@@ -23,6 +21,11 @@ from  model_modules.video_prediction.metrics import *
 import xarray as xr
 
 
+def skill_score(tar_score,ref_score,best_score):
+    ss = (tar_score-ref_score) / (best_score-ref_score)
+    return ss
+
+
 class MetaPostprocess(object):
 
     def __init__(self, root_dir: str = "/p/project/deepacf/deeprain/video_prediction_shared_folder/",