diff --git a/app/task_worker.py b/app/task_worker.py
index f14c131..2428d8e 100644
--- a/app/task_worker.py
+++ b/app/task_worker.py
@@ -197,7 +197,7 @@ def do_query_task_list(params):
 
 
 def sort_key(item):
-    return (item['task_state'], item['progress'], item['plan_end_time'])
+    return (item['task_state'], item['progress'], -item['plan_end_time'])
 
 
 def make_hashable(obj):