diff --git a/apps/resm/tasks.py b/apps/resm/tasks.py
index 8e8ebdb..13ef793 100644
--- a/apps/resm/tasks.py
+++ b/apps/resm/tasks.py
@@ -11,6 +11,7 @@ from lxml import etree
 from celery import current_app
 from datetime import datetime
 import random
+import time
 
 config.email = "caoqianming@foxmail.com"
 config.max_retries = 0
@@ -361,6 +362,9 @@ def save_pdf_from_openalex(paper:Paper):
         paper.fetch_status = "fulltext_ready"
         paper.save(update_fields=["has_fulltext", "has_fulltext_pdf", "fetch_status", "update_time"])
         return "success"
+    elif res.status_code == 429:
+        time.sleep(random.randint(1, 10))
+        return save_pdf_from_openalex(paper)
 
 
 # https://sci.bban.top/pdf/10.1016/j.conbuildmat.2020.121016.pdf?download=true
\ No newline at end of file