diff --git a/lib/tasks/contest_work_evaluation.rake b/lib/tasks/contest_work_evaluation.rake
index d97d4ba3d..6d72d4f01 100644
--- a/lib/tasks/contest_work_evaluation.rake
+++ b/lib/tasks/contest_work_evaluation.rake
@@ -3,7 +3,10 @@
 namespace :contest_work_evaluation do
   desc "start and end evaluation"
   def get_assigned_contestant_works(judges, n, index, num)
-    judges[(index % num) .. ((index + n - 1) % num)]
+    judges = judges + judges
+    first_index = (index * n) % num
+    last_index = (index * n + n - 1) % num < first_index ? ((index * n + n - 1) % num) + num : (index * n + n - 1) % num
+    judges[first_index .. last_index]
   end
   # 获取竞赛的评委人员
   def contest_judges contest