diff --git a/SubMind.py b/SubMind.py
index e4092a2..744b2a6 100644
--- a/SubMind.py
+++ b/SubMind.py
@@ -48,7 +48,7 @@ DB_FILE = 'submind.db'
 
 # 自动更新配置
 UPDATE_OWNER_ID = os.getenv('UPDATE_OWNER_ID')  # 仅允许此用户执行 /update
-AUTO_UPDATE_REMOTE = os.getenv('AUTO_UPDATE_REMOTE', 'gitllc')
+AUTO_UPDATE_REMOTE = os.getenv('AUTO_UPDATE_REMOTE', '').strip()
 AUTO_UPDATE_BRANCH = os.getenv('AUTO_UPDATE_BRANCH', 'main')
 
 # --- 对话处理器状态 ---
@@ -1625,6 +1625,49 @@ def _can_run_update(user_id: int) -> bool:
         return False
 
 
+def _resolve_update_target(repo_dir: str):
+    """
+    解析更新目标 remote/branch。
+    优先级：
+    1) 环境变量 AUTO_UPDATE_REMOTE + AUTO_UPDATE_BRANCH
+    2) 当前分支上游 @{u}
+    3) 远程优先 gitllc，其次 origin，分支用 AUTO_UPDATE_BRANCH 或 main
+    """
+    branch = (AUTO_UPDATE_BRANCH or 'main').strip() or 'main'
+
+    # 1) 明确指定 remote
+    if AUTO_UPDATE_REMOTE:
+        return AUTO_UPDATE_REMOTE, branch
+
+    # 2) 尝试读取上游分支（如 gitllc/main）
+    upstream_proc = subprocess.run(
+        ["git", "rev-parse", "--abbrev-ref", "--symbolic-full-name", "@{u}"],
+        cwd=repo_dir, capture_output=True, text=True
+    )
+    if upstream_proc.returncode == 0:
+        upstream = upstream_proc.stdout.strip()
+        if '/' in upstream:
+            remote, up_branch = upstream.split('/', 1)
+            if remote and up_branch:
+                return remote, up_branch
+
+    # 3) 回退：从远程列表推断
+    remotes_proc = subprocess.run(["git", "remote"], cwd=repo_dir, capture_output=True, text=True)
+    if remotes_proc.returncode != 0:
+        return None, None
+
+    remotes = [r.strip() for r in remotes_proc.stdout.splitlines() if r.strip()]
+    if not remotes:
+        return None, None
+
+    if 'gitllc' in remotes:
+        return 'gitllc', branch
+    if 'origin' in remotes:
+        return 'origin', branch
+
+    return remotes[0], branch
+
+
 async def update_bot(update: Update, context: CallbackContext):
     user_id = update.effective_user.id
     if not _can_run_update(user_id):
@@ -1636,7 +1679,12 @@ async def update_bot(update: Update, context: CallbackContext):
     repo_dir = os.path.dirname(os.path.abspath(__file__))
 
     try:
-        fetch_cmd = ["git", "fetch", AUTO_UPDATE_REMOTE, AUTO_UPDATE_BRANCH]
+        remote_name, branch_name = _resolve_update_target(repo_dir)
+        if not remote_name or not branch_name:
+            await update.message.reply_text("更新失败：无法解析 git 远程仓库，请检查仓库 remote 配置。")
+            return
+
+        fetch_cmd = ["git", "fetch", remote_name, branch_name]
         fetch_proc = subprocess.run(fetch_cmd, cwd=repo_dir, capture_output=True, text=True)
         if fetch_proc.returncode != 0:
             err = (fetch_proc.stderr or fetch_proc.stdout or "未知错误").strip()
@@ -1647,7 +1695,7 @@ async def update_bot(update: Update, context: CallbackContext):
             ["git", "rev-parse", "HEAD"], cwd=repo_dir, capture_output=True, text=True
         )
         remote_rev = subprocess.run(
-            ["git", "rev-parse", f"{AUTO_UPDATE_REMOTE}/{AUTO_UPDATE_BRANCH}"],
+            ["git", "rev-parse", f"{remote_name}/{branch_name}"],
             cwd=repo_dir, capture_output=True, text=True
         )
 
@@ -1663,7 +1711,7 @@ async def update_bot(update: Update, context: CallbackContext):
             return
 
         reset_proc = subprocess.run(
-            ["git", "reset", "--hard", f"{AUTO_UPDATE_REMOTE}/{AUTO_UPDATE_BRANCH}"],
+            ["git", "reset", "--hard", f"{remote_name}/{branch_name}"],
             cwd=repo_dir, capture_output=True, text=True
         )
         if reset_proc.returncode != 0:
@@ -1680,7 +1728,10 @@ async def update_bot(update: Update, context: CallbackContext):
             await update.message.reply_text(f"依赖安装失败：\n<code>{escape_html(err[-1800:])}</code>", parse_mode='HTML')
             return
 
-        await update.message.reply_text("更新完成，正在重启机器人…")
+        await update.message.reply_text(
+            f"更新完成（{escape_html(remote_name)}/{escape_html(branch_name)}），正在重启机器人…",
+            parse_mode='HTML'
+        )
         os.execv(sys.executable, [sys.executable] + sys.argv)
 
     except Exception as e: