diff --git a/apps/resm/tasks.py b/apps/resm/tasks.py
index da1ac8e..ef5a88e 100644
--- a/apps/resm/tasks.py
+++ b/apps/resm/tasks.py
@@ -21,6 +21,12 @@ config.retry_http_codes = [429, 500, 503]
 OPENALEX_KEY = "NPimoE2ecdWmfdhH8abxEp"
 config.api_key = OPENALEX_KEY
 
+ELSEVIER_APIKEY = 'aa8868cac9e27d6153ab0a0acd7b50bf'
+ELSEVIER_HEAEDERS = {
+    "X-ELS-APIKey": ELSEVIER_APIKEY,
+    "X-ELS-Insttoken": "135fa874aea9f0de11cad187ccb4878c "
+}
+
 @shared_task(base=CustomTask)
 def get_paper_meta_from_openalex(publication_year:int, keywords:str="", search:str="", end_year:int=None):
     cache_key = f"openalex_cursor_{publication_year}_{keywords}{search}"
@@ -94,9 +100,6 @@ def get_paper_meta_from_openalex(publication_year:int, keywords:str="", search:s
             countdown=5
         )
 
-
-ELSEVIER_APIKEY = 'aa8868cac9e27d6153ab0a0acd7b50bf'
-
 # 常用的 User-Agent 列表
 USER_AGENTS = [
     "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36",
@@ -191,7 +194,8 @@ def get_abstract_from_elsevier(number_of_task:int = 20):
                     if has_fulltext:
                         paper.has_fulltext = True
                         paper.has_fulltext_xml = True
-                        save_pdf_from_elsevier(paper)
+                        if paper.has_fulltext_pdf is False:
+                            save_pdf_from_elsevier(paper)
                         count_fulltext += 1
                         
                     paper.save_file_xml(xml_str)