diff --git a/ETL/L2_Builder.py b/ETL/L2_Builder.py
index 83b0dce..41b3d0e 100644
--- a/ETL/L2_Builder.py
+++ b/ETL/L2_Builder.py
@@ -1100,7 +1100,11 @@ def save_match(cursor, m: MatchData):
             ON CONFLICT(steam_id_64) DO UPDATE SET
                 uid=excluded.uid,
                 username=excluded.username,
-                avatar_url=excluded.avatar_url,
+                avatar_url=CASE 
+                    WHEN excluded.avatar_url IS NOT NULL AND excluded.avatar_url != '' 
+                    THEN excluded.avatar_url 
+                    ELSE dim_players.avatar_url 
+                END,
                 domain=excluded.domain,
                 created_at=excluded.created_at,
                 updated_at=excluded.updated_at,
diff --git a/downloader/README.md b/downloader/README.md
index b1ea2de..f38b2b3 100644
--- a/downloader/README.md
+++ b/downloader/README.md
@@ -31,7 +31,7 @@ python downloader.py --url https://arena.5eplay.com/data/match/g161-202601182227
 批量下载（从文件读取 URL）：
 
 ```bash
-python downloader/downloader.py --url-list gamelist/match_list_2026.txt -concurrent 8
+python downloader/downloader.py --url-list gamelist/match_list_2026.txt --concurrent 4 --headless true --fetch-type iframe
 ```
 
 指定输出目录：