git push　报错！！！！

[root@NB sh]# git push
To git@x0.xx.xxx.x1:yanjing_chenl/IT-DOC.git
 ! [rejected]        master -> master (non-fast-forward)
error: failed to push some refs to ‘git@xx.x.x.x1:yanjing_chenl/IT-DOC.git‘
To prevent you from losing history, non-fast-forward updates were rejected
Merge the remote changes before pushing again.  See the ‘Note about
fast-forwards‘ section of ‘git push --help‘ for details.

[root@NB sh]# git pull
remote: Counting objects: 4, done.
remote: Compressing objects: 100% (4/4), done.
remote: Total 4 (delta 2), reused 0 (delta 0)
Unpacking objects: 100% (4/4), done.
From xx.xx.xx.x1:yanjing_chenl/IT-DOC
   3152d76..75ffcb1  master     -> origin/master
Auto-merging sh/GUOER.SH
Merge made by recursive.
 sh/GUOER.SH |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

[root@NB sh]# git push
Counting objects: 14, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (8/8), done.
Writing objects: 100% (8/8), 893 bytes, done.
Total 8 (delta 4), reused 0 (delta 0)
To git@xx.xx.xx.x1:yanjing_chenl/IT-DOC.git
   75ffcb1..03424a3  master -> master