diff --git a/apps/resm/tasks.py b/apps/resm/tasks.py
index ea0455b..3db86b2 100644
--- a/apps/resm/tasks.py
+++ b/apps/resm/tasks.py
@@ -333,11 +333,13 @@ def send_download_fulltext_task(number_of_task=100):
 
 @shared_task(base=CustomTask)
 def release_working_paper(minutes=10):
-    now = datetime.now()
-    five_minutes_ago = datetime.now() - timedelta(minutes=minutes)
-    qs = Paper.objects.filter(fetch_status__isnull=False, update_time__lte= five_minutes_ago)
-    x = qs.update(fetch_status=None, update_time=now)
-    return f"release {x} papers"
+    qs = Paper.objects.filter(fetch_status="downloading")
+    count = 0
+    for paper in qs:
+        if paper.update_time < datetime.now() - timedelta(minutes=minutes):
+            paper.fetch_end()
+            count += 1
+    return f"release {count} papers"
 
 @shared_task(base=CustomTask)
 def download_pdf(paper_id):