diff --git a/core/post_to_fedi.py b/core/post_to_fedi.py
index ac5a92f..bdccfc7 100644
--- a/core/post_to_fedi.py
+++ b/core/post_to_fedi.py
@@ -1,4 +1,4 @@
-from aiogram.types import Message
+from aiogram.types import Message, CallbackQuery
 from aiogram.fsm.context import FSMContext
 from aiogram.fsm.state import State, StatesGroup
 from aiogram import Router
@@ -99,13 +99,63 @@ async def handle_post_to_fedi(message: Message):
     if not user_cred_files:
         await message.reply('请先使用 /fauth 命令进行身份验证')
         return
+    arguments = message.text.replace('/post', '', 1).strip().split(' ')
+    specified_instance = None
+    visibility = None
+    if len(arguments) >= 1 and arguments[0]:
+        # 检查第一个参数是否是实例名
+        first_arg = arguments[0]
+        # 检查是否存在对应的凭据文件
+        matching_files = [f for f in user_cred_files if first_arg in f]
+        if matching_files:
+            specified_instance = first_arg
+            if len(arguments) >= 2:
+                visibility = arguments[1]
+        else:
+            visibility = arguments[0]
+    # 如果指定了实例，使用指定的实例
+    if specified_instance:
+        cred_file = next(f for f in user_cred_files if specified_instance in f)
+        filename = os.path.basename(cred_file)
+        parts = filename.split('_')
+        instance = '_'.join(parts[1:-2])
+    else:
+        # 如果有多个实例，让用户选择
+        if len(user_cred_files) > 1:
+            from aiogram.types import InlineKeyboardMarkup, InlineKeyboardButton
 
-    # 从文件名中提取实例名
-    cred_file = user_cred_files[0]  # 假设用户只绑定一个实例
-    filename = os.path.basename(cred_file)
-    # 格式: realbot_{instance}_{userid}_usercred.secret
-    parts = filename.split('_')
-    instance = '_'.join(parts[1:-2])  # 提取实例名部分
+            # 提取所有实例名
+            instances = []
+            for cred_file in user_cred_files:
+                filename = os.path.basename(cred_file)
+                parts = filename.split('_')
+                instance_name = '_'.join(parts[1:-2])
+                instances.append(instance_name)
+
+
+            # 创建选择按钮
+            keyboard = []
+            for instance_name in instances:
+                keyboard.append([InlineKeyboardButton(
+                    text=f"{instance_name}",
+                    callback_data=f"post:{instance_name}:"
+                )])
+
+            # 添加全部发送选项
+            keyboard.append([InlineKeyboardButton(
+                text="发送到所有实例",
+                callback_data="post_instance:all"
+            )])
+
+            reply_markup = InlineKeyboardMarkup(inline_keyboard=keyboard)
+            await message.reply("请选择要发送到的实例：\n（实验性，目前还不能使用）", reply_markup=reply_markup)
+            return
+        else:
+            # 只有一个实例，直接使用
+            cred_file = user_cred_files[0]
+            filename = os.path.basename(cred_file)
+            parts = filename.split('_')
+            instance = '_'.join(parts[1:-2])
 
     mastodon = Mastodon(
         access_token=f'{cred_file}',
@@ -114,12 +164,6 @@ async def handle_post_to_fedi(message: Message):
 
     # 发布消息到联邦网络
     try:
-        arguments = message.text.replace('/post', '', 1).strip().split(' ')
-        if len(arguments) >= 1 and arguments[0]:
-            visibility = arguments[0]  # 默认可见性为账号设置的可见性
-        else:
-            visibility = None
-
         status_message = await message.reply('尝试发布消息到联邦网络...')
         # 处理图片附件
         media_ids = []
@@ -145,4 +189,64 @@ async def handle_post_to_fedi(message: Message):
         status_url = status['url']
         await status_message.edit_text(f'消息已成功发布到联邦网络！\n{status_url}')
     except Exception as e:
-        await message.reply(f'发布失败: {str(e)}')
\ No newline at end of file
+        await message.reply(f'发布失败: {str(e)}')
+
+
+@router.callback_query(lambda c: c.data.startswith('post:'))
+async def handle_instance_selection(callback: CallbackQuery):
+    """处理实例选择回调"""
+    await callback.answer()
+
+    data_parts = callback.data.split(':')
+
+    selected_instance = data_parts[1]
+
+    # 获取原始回复消息
+    # 获取原始 /post 命令消息，然后获取它回复的消息
+    post_command_message = callback.message.reply_to_message
+    original_message = post_command_message.reply_to_message if post_command_message else None
+    if not original_message:
+        await callback.message.edit_text("错误：找不到原始消息")
+        return
+
+    user_id = callback.from_user.id
+
+    mastodon = Mastodon(
+        access_token=f'secrets/realbot_{selected_instance}_{user_id}_usercred.secret',
+        api_base_url=f'https://{selected_instance}'
+    )
+
+    # 发布消息到联邦网络
+    try:
+        status_message = await original_message.reply('尝试发布消息到联邦网络...')
+        # 处理图片附件
+        media_ids = []
+        cb_arguments = original_message.text.replace('/post', '', 1).strip().split(' ')
+        if not original_message.reply_to_message:
+            await status_message.edit_text("错误：找不到要发布的消息")
+            return
+
+        if original_message.reply_to_message.photo:
+            await status_message.edit_text('正在处理图片附件...')
+            # 获取最大尺寸的图片
+            photo = original_message.reply_to_message.photo[-1]
+            file_info = await callback.message.bot.get_file(photo.file_id)
+            file_data = await callback.message.bot.download_file(file_info.file_path)
+
+            # 上传图片到Mastodon
+            media = mastodon.media_post(file_data, mime_type='image/png')
+            media_ids.append(media['id'])
+        text = original_message.reply_to_message.text
+        if media_ids:
+            text = original_message.reply_to_message.caption
+        # 发布消息
+        status = mastodon.status_post(
+            text,
+            media_ids=media_ids if media_ids else None,
+            visibility = cb_arguments[0] if len(cb_arguments) == 1 else None  # 默认为账户默认可见性
+        )
+        status_url = status['url']
+        await status_message.edit_text(f'消息已成功发布到联邦网络！\n{status_url}')
+        await callback.message.delete()
+    except Exception as e:
+        await status_message.edit_text(f'发布失败: {str(e)}')