diff --git a/autoload/SpaceVim/layers/lang/c.vim b/autoload/SpaceVim/layers/lang/c.vim
index c589c30b4..ea8605d32 100644
--- a/autoload/SpaceVim/layers/lang/c.vim
+++ b/autoload/SpaceVim/layers/lang/c.vim
@@ -45,19 +45,21 @@ let s:clang_executable = 'clang'
 let s:SYSTEM = SpaceVim#api#import('system')
 function! SpaceVim#layers#lang#c#plugins() abort
   let plugins = []
-  if g:spacevim_autocomplete_method ==# 'deoplete'
-    if s:use_libclang
-      call add(plugins, ['zchee/deoplete-clang'])
+  if !SpaceVim#layers#lsp#check_filetype('c') && !SpaceVim#layers#lsp#check_filetype('cpp')
+    if g:spacevim_autocomplete_method ==# 'deoplete'
+      if s:use_libclang
+        call add(plugins, ['zchee/deoplete-clang'])
+      else
+        call add(plugins, ['SpaceVim/deoplete-clang2'])
+      endif
+    elseif g:spacevim_autocomplete_method ==# 'ycm'
+      " no need extra plugins
+    elseif g:spacevim_autocomplete_method ==# 'completor'
+      " no need extra plugins
+    elseif g:spacevim_autocomplete_method ==# 'asyncomplete'
     else
-      call add(plugins, ['SpaceVim/deoplete-clang2'])
+      call add(plugins, ['Rip-Rip/clang_complete'])
     endif
-  elseif g:spacevim_autocomplete_method ==# 'ycm'
-    " no need extra plugins
-  elseif g:spacevim_autocomplete_method ==# 'completor'
-    " no need extra plugins
-  elseif g:spacevim_autocomplete_method ==# 'asyncomplete'
-  else
-    call add(plugins, ['Rip-Rip/clang_complete'])
   endif
   if has('nvim')
     if has('python3')
diff --git a/autoload/SpaceVim/layers/lang/dart.vim b/autoload/SpaceVim/layers/lang/dart.vim
index edfde544a..112b799f7 100644
--- a/autoload/SpaceVim/layers/lang/dart.vim
+++ b/autoload/SpaceVim/layers/lang/dart.vim
@@ -1,7 +1,9 @@
 function! SpaceVim#layers#lang#dart#plugins() abort
   let plugins = []
   call add(plugins, ['dart-lang/dart-vim-plugin', {'merged' : 0}])
-  call add(plugins, ['SpaceVim/deoplete-dart', {'merged' : 0}])
+  if !SpaceVim#layers#lsp#check_filetype('dart')
+    call add(plugins, ['SpaceVim/deoplete-dart', {'merged' : 0}])
+  endif
   return plugins
 endfunction
 
@@ -29,4 +31,12 @@ function! s:language_specified_mappings() abort
   call SpaceVim#mapping#space#langSPC('nmap', ['l','s', 's'],
         \ 'call SpaceVim#plugins#repl#send("selection")',
         \ 'send selection and keep code buffer focused', 1)
+  if SpaceVim#layers#lsp#check_filetype('dart')
+    nnoremap <silent><buffer> K :call SpaceVim#lsp#show_doc()<CR>
+
+    call SpaceVim#mapping#space#langSPC('nnoremap', ['l', 'd'],
+          \ 'call SpaceVim#lsp#show_doc()', 'show_document', 1)
+    call SpaceVim#mapping#space#langSPC('nnoremap', ['l', 'e'],
+          \ 'call SpaceVim#lsp#rename()', 'rename symbol', 1)
+  endif
 endfunction
diff --git a/autoload/SpaceVim/layers/lsp.vim b/autoload/SpaceVim/layers/lsp.vim
index 963687e34..e36c948b4 100644
--- a/autoload/SpaceVim/layers/lsp.vim
+++ b/autoload/SpaceVim/layers/lsp.vim
@@ -78,6 +78,7 @@ let s:lsp_servers = {
       \ 'cpp' : ['clangd'],
       \ 'objc' : ['clangd'],
       \ 'objcpp' : ['clangd'],
+      \ 'dart' : ['dart_language_server'],
       \ 'go' : ['go-langserver', '-mode', 'stdio'],
       \ 'rust' : ['rustup', 'run', 'nightly', 'rls'],
       \ 'python' : ['pyls'],