diff --git a/scripts/ci/auto_fix_formatting.py b/scripts/ci/auto_fix_formatting.py
index 74baed74e..aa899fe16 100755
--- a/scripts/ci/auto_fix_formatting.py
+++ b/scripts/ci/auto_fix_formatting.py
@@ -23,6 +23,49 @@ def run(cmd, check=True, capture=True, cwd=None):
     return result
 
 
+def ensure_git_repo(api_url, repo, token, pr_number):
+    """确保当前目录是git仓库。
+    
+    checkout脚本用tarball方式下载代码，没有.git目录。
+    这里自动初始化git仓库、拉取远端分支，确保后续git操作可用。
+    tarball内容与PR HEAD完全一致，checkout后git status为clean。
+    """
+    if os.path.exists(".git"):
+        return
+
+    print("检测到tarball checkout（无.git目录），自动初始化git仓库...")
+    
+    # 构造带认证的远端URL
+    server_url = api_url.rsplit("/api/v1", 1)[0]
+    remote_url = f"{server_url.replace('https://', f'https://x-access-token:{token}@')}/{repo}.git"
+    
+    # 获取PR的源分支
+    pr_api_url = f"{api_url}/repos/{repo}/pulls/{pr_number}"
+    req = urllib.request.Request(pr_api_url, headers={"Authorization": f"token {token}"})
+    with urllib.request.urlopen(req) as resp:
+        pr = json.loads(resp.read())
+    head_branch = pr["head"]["ref"]
+    
+    print(f"PR源分支: {head_branch}")
+    
+    # 初始化git并拉取远端分支
+    run("git init -q")
+    run(f"git remote add origin {remote_url}")
+    run("git config user.name \"CI Bot\"")
+    run("git config user.email \"ci-bot@xiaoxiajianji.com\"")
+    
+    print("拉取远端分支...")
+    run(f"git fetch --depth=1 origin {head_branch}")
+    run(f"git checkout -B {head_branch} FETCH_HEAD")
+    
+    # tarball内容与HEAD一致，checkout后应该是clean状态
+    result = run("git status --porcelain")
+    if result.stdout.strip():
+        print(f"⚠️  注意：tarball与HEAD有差异 ({len(result.stdout.strip().splitlines())} 个文件)")
+    else:
+        print("✅ git仓库就绪，工作区clean")
+
+
 def get_changed_files(pr_number, api_url, token):
     """获取PR中变更的文件列表"""
     url = f"{api_url}/pulls/{pr_number}/files?limit=100"
@@ -91,9 +134,7 @@ def fix_frontend(target_fe_files, scan_mode, repo_root):
 
     if scan_mode == "incremental":
         # 增量模式：只格式化变更的前端文件
-        # 转换为相对于 apps/web 的路径或用绝对路径
         target_str = " ".join(target_fe_files)
-        # 从项目根目录运行，prettier 会找配置文件
         cmd = f"{prettier_bin} --write {target_str}"
     else:
         # 全量模式：格式化整个前端目录
@@ -129,6 +170,9 @@ def main():
         sys.exit(1)
 
     repo_root = os.getcwd()
+    
+    # 确保git仓库可用（tarball checkout模式下自动初始化）
+    ensure_git_repo(api_url, repo, token, pr_number)
 
     print("=== 检测到代码格式问题，尝试自动修复 ===")
     print(f"PR #{pr_number}")
@@ -136,20 +180,9 @@ def main():
 
     # 前端文件扩展名
     fe_extensions = (
-        ".ts",
-        ".tsx",
-        ".js",
-        ".jsx",
-        ".css",
-        ".scss",
-        ".less",
-        ".json",
-        ".html",
-        ".md",
-        ".yaml",
-        ".yml",
+        ".ts", ".tsx", ".js", ".jsx", ".css", ".scss", ".less",
+        ".json", ".html", ".md", ".yaml", ".yml",
     )
-    # Python 文件扩展名
     py_extensions = (".py",)
 
     # 确定要修复的文件范围
@@ -160,15 +193,13 @@ def main():
         print(f"增量模式: {len(target_py_files)} 个Python文件, {len(target_fe_files)} 个前端文件")
     else:
         target_py_files = ["alembic", "apps", "packages", "tests", "scripts"]
-        # 全量模式下 prettier 在前端目录内部运行，无需传文件列表
-        target_fe_files = ["apps/web"]  # 标记为有前端文件需要处理
+        target_fe_files = ["apps/web"]
         print("全量模式，修复所有文件")
 
     # Python 格式化
     fix_python(target_py_files, scan_mode)
 
     # 前端格式化
-    # 全量模式下直接传 web 目录标记
     if scan_mode != "incremental":
         fix_frontend(["apps/web"], scan_mode, repo_root)
     else:
@@ -186,10 +217,6 @@ def main():
     for line in result.stdout.strip().split("\n"):
         print(f"  {line}")
 
-    # 配置git
-    run('git config user.name "CI Bot"')
-    run('git config user.email "ci-bot@xiaoxiajianji.com"')
-
     # 提交修复
     run("git add -A")
     run('git commit -m "style: auto-format with black + isort + prettier [ci skip]"')