diff --git a/auto-analysis/utils.py b/auto-analysis/utils.py
index a6027de..56b4f33 100644
--- a/auto-analysis/utils.py
+++ b/auto-analysis/utils.py
@@ -46,7 +46,7 @@ def extract_file(from_path, to_path):
 
 def patch_file(_key, _iv):
     patch_file_path = os.path.join(BASE_DIR, "../typora.py")
-    fd = open(patch_file_path, "a")
+    fd = open(patch_file_path, "a+")
     content = fd.read()
     content = content.replace("{AES_KEY}", f"b''.fromhex('{_key}')")
     content = content.replace("{AES_IV}", f"b''.fromhex('{_iv}')")