diff --git a/autoload/SpaceVim.vim b/autoload/SpaceVim.vim
index 723c7f48f..76454321f 100644
--- a/autoload/SpaceVim.vim
+++ b/autoload/SpaceVim.vim
@@ -94,6 +94,10 @@ let g:spacevim_guifont                 = ''
 "   let g:spacevim_enable_ycm = 1
 " <
 let g:spacevim_enable_ycm              = 0
+""
+" Set the width of value of spacevim sidebar width, and this value will be
+" used by tagbar, vimfiler, mundo etc. default it is 30.
+let g:spacevim_sidebar_width           = 30
 let g:spacevim_enable_neocomplcache    = 0
 ""
 " Enable cursorline
diff --git a/config/plugins/vimfiler.vim b/config/plugins/vimfiler.vim
index 476f4566b..6e76cf23a 100644
--- a/config/plugins/vimfiler.vim
+++ b/config/plugins/vimfiler.vim
@@ -26,7 +26,7 @@ endif
 
 call vimfiler#custom#profile('default', 'context', {
             \ 'explorer' : 1,
-            \ 'winwidth' : 30,
+            \ 'winwidth' : get(g:, 'spacevim_sidebar_width', 30) ,
             \ 'winminwidth' : 30,
             \ 'toggle' : 1,
             \ 'columns' : 'type',
diff --git a/doc/SpaceVim.txt b/doc/SpaceVim.txt
index e19dd1ca0..7bf6dfe2d 100644
--- a/doc/SpaceVim.txt
+++ b/doc/SpaceVim.txt
@@ -124,6 +124,10 @@ Disable/Enable YouCompleteMe, by default it is disabled. To enable it:
   let g:spacevim_enable_ycm = 1
 <
 
+                                                    *g:spacevim_sidebar_width*
+Set the width of value of spacevim sidebar width, and this value will be used
+by tagbar, vimfiler, mundo etc. default it is 30.
+
                                                 *g:spacevim_enable_cursorline*
 Enable cursorline
 >