Select Copy Not Work

Hi,
I am trying to enable the select copy to system clipboard.
My intention is to use "v" to select part to copy, and press "Y" to copy
to system clipboard.
Bellowing is my part of my vim script:
[code]
nnoremap Y "+yy
clipboard=unnamedplus
[/code]
Bellowing is my vim version information:
[code]
huangyingw@mini14:~$ vim --version
VIM - Vi IMproved 7.4 (2013 Aug 10, compiled Jan 2 2014 19:39:59)
Included patches: 1-52
huangyingw@mini14:~$ vim --version|grep clipboard
+clipboard +iconv +path_extra +toolbar
+eval +mouse_dec +startuptime +xterm_clipboard
huangyingw@mini14:~$
[/code]




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