diff --git a/docs/api/notify.md b/docs/api/notify.md
index 6914c1971..fa78a1009 100644
--- a/docs/api/notify.md
+++ b/docs/api/notify.md
@@ -28,9 +28,22 @@ This api provides some basic Functions for generating notifications.
 
 ## Usage
 
+Vim Script:
+
 ```vim
 let s:NOTIFY = SpaceVim#api#import('notify')
 let s:NOTIFY.notify_max_width = 40
 let s:NOTIFY.timeout = 3000
 call s:NOTIFY.notify('This is a simple notification!')
 ```
+
+Lua:
+
+**Note:** lua version can only be used in neovim
+
+```lua
+local noti = require('spacevim.api').import('notify')
+noti.notify_max_width = 40
+noti.timeout = 3000
+noti.notify('This is a simple notification!')
+```
diff --git a/lua/config/nvim-cmp.lua b/lua/config/nvim-cmp.lua
index c2b7a8042..23abbdbcb 100644
--- a/lua/config/nvim-cmp.lua
+++ b/lua/config/nvim-cmp.lua
@@ -105,7 +105,18 @@ cmp.setup({
     { name = 'path' },
     { name = 'neosnippet' },
   }, {
-    { name = 'buffer' },
+    {
+      name = 'buffer',
+      option = {
+        get_bufnrs = function()
+          local bufs = {}
+          for _, win in ipairs(vim.api.nvim_list_wins()) do
+            bufs[vim.api.nvim_win_get_buf(win)] = true
+          end
+          return vim.tbl_keys(bufs)
+        end
+      }
+    },
   }),
 })
 -- `/` cmdline setup.
diff --git a/lua/spacevim/api/neovim/floating.lua b/lua/spacevim/api/neovim/floating.lua
new file mode 100644
index 000000000..9a7280f66
--- /dev/null
+++ b/lua/spacevim/api/neovim/floating.lua
@@ -0,0 +1,11 @@
+--!/usr/bin/lua
+local M = {}
+
+
+function M.exists() -- {{{
+  return true
+end
+
+
+return M
+-- }}}
diff --git a/lua/spacevim/api/notify.lua b/lua/spacevim/api/notify.lua
new file mode 100644
index 000000000..9c3b13be2
--- /dev/null
+++ b/lua/spacevim/api/notify.lua
@@ -0,0 +1,255 @@
+--=============================================================================
+-- notify.lua --- notift api for spacevim
+-- Copyright (c) 2016-2023 Wang Shidong & Contributors
+-- Author: Wang Shidong < wsdjeg@outlook.com >
+-- URL: https://spacevim.org
+-- License: GPLv3
+--=============================================================================
+
+local M = {}
+
+M.__password = require('spacevim.api').import('password')
+
+local empty = function(expr)
+  return vim.fn.empty(expr) == 1
+end
+
+local extend = function(t1, t2) -- {{{
+  for _, v in ipairs(t2) do
+    table.insert(t1, v)
+  end
+end
+
+local notifications = {}
+
+M.message = {}
+M.notification_width = 1
+M.notify_max_width = 0
+M.winid = -1
+M.bufnr = -1
+M.border = {}
+M.border.winid = -1
+M.border.bufnr = -1
+M.borderchars = { '─', '│', '─', '│', '┌', '┐', '┘', '└' }
+M.title = ''
+M.winblend = 0
+M.timeout = 3000
+M.hashkey = ''
+M.config = {}
+
+---@param msg string|table<string> notification messages
+---@param opts table notify options
+---  - title: string, the notify title
+function M.notify(msg, opts) -- {{{
+  opts = opts or {}
+  if M.is_list_of_string(msg) then
+    extend(M.message, msg)
+  elseif type(msg) == 'string' then
+    table.insert(M.message, msg)
+  end
+  if M.notify_max_width == 0 then
+    M.notify_max_width = vim.o.columns * 0.35
+  end
+  M.notification_color = opts.color or 'Normal'
+  if empty(M.hashkey) then
+    M.hashkey = M.__password.generate_simple(10)
+  end
+  M.redraw_windows()
+  vim.fn.setbufvar(M.bufnr, '&number', 0)
+  vim.fn.setbufvar(M.bufnr, '&relativenumber', 0)
+  vim.fn.setbufvar(M.bufnr, '&cursorline', 0)
+  vim.fn.setbufvar(M.bufnr, '&bufhidden', 'wipe')
+  vim.fn.setbufvar(M.border.bufnr, '&number', 0)
+  vim.fn.setbufvar(M.border.bufnr, '&relativenumber', 0)
+  vim.fn.setbufvar(M.border.bufnr, '&cursorline', 0)
+  vim.fn.setbufvar(M.border.bufnr, '&bufhidden', 'wipe')
+  extend(notifications, { [M.hashkey] = M })
+  M.increase_window()
+  if type(msg) == 'table' then
+    vim.fn.timer_start(M.timeout, M.close, { ['repeat'] = #msg })
+  else
+    vim.fn.timer_start(M.timeout, M.close, { ['repeat'] = 1 })
+  end
+end
+---@param msg table<string> # a string message list
+---@return number
+local function msg_real_len(msg)
+  local l = 0
+  for _, m in pairs(msg) do
+    l = l + vim.fn.len(vim.fn.split(m, '\n'))
+  end
+  return l
+end
+
+function M.close_all() -- {{{
+  M.message = {}
+
+  if M.win_is_open then
+    vim.api.nvim_win_close(M.border.winid, true)
+    vim.api.nvim_win_close(M.winid, true)
+  end
+
+  if notifications[M.hashkey] then
+    notifications[M.hashkey] = nil
+  end
+  M.notification_width = 1
+end
+-- }}}
+
+function M.win_is_open()
+  if M.winid > 0 then
+    return vim.api.nvim_win_is_valid(M.winid)
+  else
+    return false
+  end
+end
+-- }}}
+
+function M.is_list_of_string(t) -- {{{
+  if type(t) == 'table' then
+    for _, v in pairs(t) do
+      if type(v) ~= 'string' then
+        return false
+      end
+    end
+    return true
+  end
+  return false
+end
+-- }}}
+
+local function message_body(m) -- {{{
+  local b = {}
+  for _, v in pairs(m) do
+    extend(b, vim.split(v, '\n'))
+  end
+  return b
+end
+-- }}}
+
+function M.redraw_windows()
+  if empty(M.message) then
+    return
+  end
+  M.begin_row = 2
+  for _, hashkey in ipairs(notifications) do
+    if hashkey ~= M.hashkey then
+      M.begin_row = M.begin_row + msg_real_len(notifications[hashkey].message) + 2
+    else
+      break
+    end
+  end
+  if M.win_is_open() then
+    vim.api.nvim_win_set_config(M.winid, {
+      relative = 'editor',
+      width = M.notification_width,
+      height = msg_real_len(M.message),
+      row = M.begin_row + 1,
+      focusable = false,
+      col = vim.o.columns - M.notification_width - 1,
+    })
+    vim.api.nvim_win_set_config(M.border.winid, {
+      relative = 'editor',
+      width = M.notification_width + 2,
+      height = msg_real_len(M.message) + 2,
+      row = M.begin_row,
+      col = vim.o.columns - M.notification_width - 2,
+      focusable = false,
+    })
+  else
+    if vim.fn.bufexists(M.border.bufnr) ~= 1 then
+      M.border.bufnr = vim.api.nvim_create_buf(false, true)
+    end
+    if vim.fn.bufexists(M.bufnr) ~= 1 then
+      M.bufnr = vim.api.nvim_create_buf(false, true)
+    end
+    M.winid = vim.api.nvim_open_win(M.bufnr, false, {
+      relative = 'editor',
+      width = M.notification_width,
+      height = msg_real_len(M.message),
+      row = M.begin_row + 1,
+      col = vim.o.columns - M.notification_width - 1,
+      focusable = false,
+    })
+    vim.api.nvim_win_set_option(M.winid, 'winhighlight', 'Normal:' .. M.notification_color)
+    M.border.winid = vim.api.nvim_open_win(M.border.bufnr, false, {
+      relative = 'editor',
+      width = M.notification_width + 2,
+      height = msg_real_len(M.message) + 2,
+      row = M.begin_row,
+      col = vim.o.columns - M.notification_width - 2,
+      focusable = false,
+    })
+    vim.api.nvim_win_set_option(M.border.winid, 'winhighlight', 'Normal:VertSplit')
+    if
+      M.winblend > 0
+      and vim.fn.exists('&winblend') == 1
+      and vim.fn.exists('*nvim_win_set_option') == 1
+    then
+      vim.api.nvim_win_set_option(M.winid, 'winblend', M.winblend)
+      vim.api.nvim_win_set_option(M.border.winid, 'winblend', M.winblend)
+    end
+  end
+  vim.api.nvim_buf_set_lines(
+    M.border.bufnr,
+    0,
+    -1,
+    false,
+    M.draw_border(M.title, M.notification_width, msg_real_len(M.message))
+  )
+  vim.api.nvim_buf_set_lines(M.bufnr, 0, -1, false, message_body(M.message))
+end
+
+function M.increase_window()
+  if M.notification_width <= M.notify_max_width and M.win_is_open() then
+    M.notification_width = M.notification_width
+      + vim.fn.min({
+        vim.fn.float2nr((M.notify_max_width - M.notification_width) * 1 / 20),
+        vim.fn.float2nr(M.notify_max_width),
+      })
+    vim.api.nvim_buf_set_lines(
+      M.border.bufnr,
+      0,
+      -1,
+      false,
+      M.draw_border(M.title, M.notification_width, msg_real_len(M.message))
+    )
+    M.redraw_windows()
+    vim.fn.timer_start(10, M.increase_window, { ['repeat'] = 1 })
+  end
+end
+
+function M.draw_border(title, width, height) -- {{{
+  local top = M.borderchars[5] .. vim.fn['repeat'](M.borderchars[1], width) .. M.borderchars[6]
+  local mid = M.borderchars[4] .. vim.fn['repeat'](' ', width) .. M.borderchars[2]
+  local bot = M.borderchars[8] .. vim.fn['repeat'](M.borderchars[3], width) .. M.borderchars[7]
+  -- local top = M.string_compose(top, 1, title)
+  local lines = { top }
+  extend(lines, vim.fn['repeat']({ mid }, height))
+  extend(lines, { bot })
+  return lines
+end
+-- }}}
+
+
+function M.close(...) -- {{{
+  if not empty(M.message) then
+    table.remove(M.message, 1)
+  end
+  if #M.message == 0 then
+    if M.win_is_open() then
+      vim.api.nvim_win_close(M.border.winid, true)
+      vim.api.nvim_win_close(M.winid, true)
+    end
+    if notifications[M.hashkey] then
+      notifications[M.hashkey] = nil
+    end
+    M.notification_width = 1
+  end
+  for hashkey, _ in pairs(notifications) do
+    notifications[hashkey].redraw_windows()
+  end
+end
+-- }}}
+
+return M
diff --git a/lua/spacevim/api/password.lua b/lua/spacevim/api/password.lua
new file mode 100644
index 000000000..bc0170070
--- /dev/null
+++ b/lua/spacevim/api/password.lua
@@ -0,0 +1,17 @@
+--!/usr/bin/lua
+local M = {}
+
+function M.generate_simple(len) -- {{{
+  local temp = vim.split('abcdefghijklmnopqrstuvwxyz1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ', '')
+  local ps = {}
+  local i = 0
+  while i < len do
+    table.insert(ps, temp[math.random(#temp)])
+    i = i + 1
+  end
+  return table.concat(ps, '')
+end
+-- }}}
+--
+--
+return M
diff --git a/lua/spacevim/api/vim/buffer.lua b/lua/spacevim/api/vim/buffer.lua
index cf5dc4dc0..a3359eaf9 100644
--- a/lua/spacevim/api/vim/buffer.lua
+++ b/lua/spacevim/api/vim/buffer.lua
@@ -54,6 +54,14 @@ function M.open_pos(cmd, filename, line, col)
     vim.fn.cursor(line, col)
 end
 
+---@param bufnr number the buffer number
+---@param opt string option name
+---@param value any option value
+function M.set_option(bufnr, opt, value)
+  
+end
+
+
 return M