diff --git a/lua/Trans/backend/baidu.lua b/lua/Trans/backend/baidu.lua
index 7b072f6..8386131 100644
--- a/lua/Trans/backend/baidu.lua
+++ b/lua/Trans/backend/baidu.lua
@@ -40,7 +40,7 @@ function M.query(data)
                 -- TEST :whether multi result
                 assert(#result == 1, 'multi result :' .. vim.inspect(result))
                 result = result[1]
-                data.result = {
+                data.result.baidu = {
                     title = result.src,
                     translation = result.dst,
                 }
@@ -48,7 +48,7 @@ function M.query(data)
             end
         end
 
-        data.result = false
+        data.result.baidu = false
         data.trace = res
     end
 
diff --git a/lua/Trans/backend/offline.lua b/lua/Trans/backend/offline.lua
index 8fad428..36d6c60 100644
--- a/lua/Trans/backend/offline.lua
+++ b/lua/Trans/backend/offline.lua
@@ -28,11 +28,8 @@ function M.query(data)
         limit = 1,
     })[1]
 
-    if res then
-        data.result = data.formatter(res)
-    end
-
 
+    data.result.offline = res and data.formatter(res) or false
     return data
 end
 
diff --git a/lua/Trans/core/conf.lua b/lua/Trans/core/conf.lua
index 0adfcaa..42ca8ad 100644
--- a/lua/Trans/core/conf.lua
+++ b/lua/Trans/core/conf.lua
@@ -8,17 +8,17 @@ if vim.fn.has('nvim-0.9') == 1 then
 end
 
 return {
-    theme = 'default', -- see lua/Trans/style/theme.lua
+    theme     = 'default', -- see lua/Trans/style/theme.lua
     auto_play = true,
-    dir = vim.fn.expand('$HOME/.vim/dict'),
-    strategy = {
+    dir       = vim.fn.expand('$HOME/.vim/dict'),
+    strategy  = {
         frontend = 'hover',
         backend = '*',
     },
-    backend = {
+    backend   = {
         timeout = 2000,
     },
-    frontend = {
+    frontend  = {
         hover = {
             title = title, -- need nvim-0.9
             width = 37,
@@ -54,12 +54,12 @@ return {
         },
     },
     -- or use emoji
-    icon = {
-        star = '',    -- ⭐
+    icon      = {
+        star     = '', -- ⭐
         notfound = ' ', -- ❔
-        yes = '✔',     -- ✔️
-        no = '',      -- ❌
-        cell = '■',    -- ■ | □ | ▇ | ▏ ▎ ▍ ▌ ▋ ▊ ▉ █
+        yes      = '✔', -- ✔️
+        no       = '', -- ❌
+        cell     = '■', -- ■ | □ | ▇ | ▏ ▎ ▍ ▌ ▋ ▊ ▉ █
     },
 }
 
diff --git a/lua/Trans/core/defines.lua  b/lua/Trans/core/defines.lua 
new file mode 100644
index 0000000..b30bcbd
--- /dev/null
+++ b/lua/Trans/core/defines.lua 	
@@ -0,0 +1,3 @@
+return {
+
+}
diff --git a/lua/Trans/core/setup.lua b/lua/Trans/core/setup.lua
index f7500fa..4b8fdcd 100644
--- a/lua/Trans/core/setup.lua
+++ b/lua/Trans/core/setup.lua
@@ -1,12 +1,38 @@
+local function set_backend_opts(conf)
+    local strategys = conf.strategy
+
+    local backend = strategys.backend
+    if type(backend) == 'string' then
+        strategys.backend = backend == '*' and backend or { backend }
+    end
+
+    for i = 2, #conf.backends do
+        local name = conf.backends[i]
+        if not strategys[name] then
+            strategys[name] = {
+                frontend = strategys.frontend,
+                backend = strategys.backend,
+            }
+        end
+    end
+end
+
+
+local function define_highlights(conf)
+    local set_hl = vim.api.nvim_set_hl
+    local highlights    = require('Trans.style.theme')[conf.theme]
+    for hl, opt in pairs(highlights) do
+        set_hl(0, hl, opt)
+    end
+end
+
 return function(opts)
     local M = require('Trans')
     if opts then
         M.conf = vim.tbl_deep_extend('force', M.conf, opts)
     end
+    local conf = M.conf
 
-    local set_hl = vim.api.nvim_set_hl
-    local hls    = require('Trans.style.theme')[M.conf.theme]
-    for hl, opt in pairs(hls) do
-        set_hl(0, hl, opt)
-    end
+    set_backend_opts(conf)
+    define_highlights(conf)
 end
diff --git a/lua/Trans/core/translate.lua b/lua/Trans/core/translate.lua
index 1f6d1c4..7f2920d 100644
--- a/lua/Trans/core/translate.lua
+++ b/lua/Trans/core/translate.lua
@@ -1,17 +1,14 @@
 local Trans = require('Trans')
 local util = Trans.util
 
-local backends = {
-    'offline',
-    'baidu',
-}
+local backends = Trans.conf.backends
 
 local function new_data(opts)
     opts = opts or {}
     local method = opts.method or ({
         n = 'normal',
         v = 'visual',
-    })(vim.api.nvim_get_mode().mode)
+    })[vim.api.nvim_get_mode().mode]
 
     local str = util.get_str(method)
     if str == '' then return end
@@ -21,6 +18,7 @@ local function new_data(opts)
         str = str,
         method = method,
         frontend = strategy.frontend,
+        result = {},
     }
 
     local backend = strategy.backend
@@ -40,6 +38,15 @@ local function new_data(opts)
 end
 
 local function set_result(data)
+    local t_backend = require('Trans.backend')
+    for _, name in data.backend do
+        local backend = t_backend[name]
+        backend.query(data)
+        if backend.no_wait then
+
+        end
+    end
+
     require('Trans.backend').baidu.query(data)
     local thread = coroutine.running()
     local resume = function()
@@ -57,9 +64,10 @@ local function set_result(data)
 end
 
 local function render_window()
-    
+
 end
 
+-- HACK : Core process logic
 local function process(opts)
     Trans.translate = coroutine.wrap(process)
 
diff --git a/lua/Trans/core/util.lua b/lua/Trans/core/util.lua
index dc0695f..6032538 100644
--- a/lua/Trans/core/util.lua
+++ b/lua/Trans/core/util.lua
@@ -46,7 +46,7 @@ function M.get_str(method)
         input = function()
             return fn.input('请输入需要查询的单词:')
         end,
-    })(method)()
+    })[method]()
 end
 
 function M.is_English(str)
diff --git a/lua/Trans/frontend/hover.lua b/lua/Trans/frontend/hover.lua
index 4d2cada..a95a71d 100644
--- a/lua/Trans/frontend/hover.lua
+++ b/lua/Trans/frontend/hover.lua
@@ -2,6 +2,9 @@ local M = {}
 
 local api = vim.api
 
+function M.process(data)
+
+end
 
 return M
 
diff --git a/lua/Trans/health.lua b/lua/Trans/health.lua
index 130d7a0..2ad3350 100644
--- a/lua/Trans/health.lua
+++ b/lua/Trans/health.lua
@@ -83,11 +83,11 @@ local function check_configure_file()
 end
 
 local function check()
+    check_database()
     check_neovim_version()
+    check_configure_file()
     check_plugin_dependencies()
     check_binary_dependencies()
-    check_database()
-    check_configure_file()
 end
 
 return { check = check, }
diff --git a/plugin/Trans.lua b/plugin/Trans.lua
index 05f78f3..44949a9 100644
--- a/plugin/Trans.lua
+++ b/plugin/Trans.lua
@@ -35,24 +35,33 @@ end, { desc = ' 自动发音' })
 
 
 --- INFO :Parse online engines config file
-local path = vim.fn.expand("$HOME/.vim/dict/Trans.json")
-local file = io.open(path, "r")
-if file then
-    local content = file:read("*a")
-    file:close()
-    local status, engines = pcall(vim.json.decode, content)
-    assert(status, 'Unable to parse json file: ' .. path)
+local function parse_engine_file()
+    local path = M.conf.dir .. '/Trans.json'
+    local file = io.open(path, "r")
 
-    engines = engines or {}
-    for k, v in pairs(engines) do
-        if not v.enable then
-            engines[k] = nil
-        end
+    if file then
+        local content = file:read("*a")
+        local status, result = pcall(vim.json.decode, content)
+        file:close()
+        assert(status, 'Unable to parse json file: ' .. path)
+        return result
     end
-
-    M.conf.engines = engines
-else
-    M.conf.engines = {}
 end
 
+M.conf.backends = { 'offline' }
+M.engines = {}
+
+local result = parse_engine_file()
+if result then
+    local backends = M.conf.backends
+    local engines = M.engines
+    for name, opts in pairs(result) do
+        if opts.enable then
+            backends[#backends + 1] = name
+            engines[name] = opts
+        end
+    end
+end
+
+
 -- new_command('TranslateInput', function() M.translate { mode = 'i' } end, { desc = '  搜索翻译', })