不知道你是不是哪步操作错了，几个命令

git branch 查看本地仓库分支
git branch --remote 查看远程仓库分支
git branch branchname 创建名为branchname的分支
git checkout branchname 切换分支为branchname
git push <remote> <branch> 推送分支到远程仓库

当前我这个testBrach是从刚创建的，然后拉取下来，是个空仓库

testBranch# ll
total 12K
drwxr-xr-x 3 root root 4.0K Apr 17 19:21 ./
drwxr-xr-x 4 root root 4.0K Apr 17 19:21 ../
drwxr-xr-x 7 root root 4.0K Apr 17 19:21 .git/

当前使用git branch没有输出任何分支

testBranch# git branch

在当前的仓库下创建一个文件叫master里面写一句话，然后提交到远程master分支

testBranch# vi master
this is master

testBranch# git add .

testBranch# git commit -m "add master"
[master (root-commit) 6dd57c5] add master
 1 file changed, 1 insertion(+)
 create mode 100644 master

testBranch# git push origin master
Counting objects: 3, done.
Writing objects: 100% (3/3), 220 bytes | 0 bytes/s, done.
Total 3 (delta 0), reused 0 (delta 0)
To /home/git/temp/testBranch/
 * [new branch]      master -> master

这下远程和本地都有master分支了，并且当前分支下有一个 master文件

testBranch# git branch
* master

testBranch# git branch --remote
  origin/master
testBranch# ll
total 16K
drwxr-xr-x 3 root root 4.0K Apr 17 19:23 ./
drwxr-xr-x 4 root root 4.0K Apr 17 19:21 ../
drwxr-xr-x 8 root root 4.0K Apr 17 19:24 .git/
-rw-r--r-- 1 root root   15 Apr 17 19:23 master

然后我们创建一个dev分支，切换到dev分支。

testBranch# git branch dev
testBranch# git checkout dev
* dev
  master
testBranch# ll
total 16K
drwxr-xr-x 3 root root 4.0K Apr 17 19:23 ./
drwxr-xr-x 4 root root 4.0K Apr 17 19:21 ../
drwxr-xr-x 8 root root 4.0K Apr 17 19:32 .git/
-rw-r--r-- 1 root root   15 Apr 17 19:23 master

这里会有master文件是因为dev分支是从master出来的，我们在T1时刻已经提交了master文件，所以T2时刻dev分支从master分支出来，会包含T2时刻master包含的所有文件。

为了这里演示我就把master删除，然后创建了一个dev文件，也写了一句话，然后提交dev分支

testBranch# git rm master
rm 'master'

testBranch# vi dev
this is dev

testBranch# git add .

testBranch# git commit -m "add dev"
[dev 155e4f5] add dev
 2 files changed, 1 insertion(+), 1 deletion(-)
 create mode 100644 dev
 delete mode 100644 master

testBranch# git push origin dev
Counting objects: 3, done.
Writing objects: 100% (3/3), 240 bytes | 0 bytes/s, done.
Total 3 (delta 0), reused 0 (delta 0)
To /home/git/temp/testBranch/
   6dd57c5..155e4f5  dev -> dev

当前本地分支和远程分支都有master和dev了

root@iZbp1ccq9xttkzab5d3fc9Z:/home/linxingyang/workdir/git/testBranch# git branch
* dev
  master
root@iZbp1ccq9xttkzab5d3fc9Z:/home/linxingyang/workdir/git/testBranch# git branch --remote
  origin/dev
  origin/master

先查看当前分支(dev)下面的内容，然后切到master分支，在切回dev分支，可以看到工作目录对应的文件是有变化的。

/testBranch# ll
total 16K
drwxr-xr-x 3 root root 4.0K Apr 17 19:40 ./
drwxr-xr-x 4 root root 4.0K Apr 17 19:21 ../
-rw-r--r-- 1 root root   12 Apr 17 19:40 dev
drwxr-xr-x 8 root root 4.0K Apr 17 19:44 .git/


testBranch# git checkout master
Switched to branch 'master'
Your branch is up-to-date with 'origin/master'.
testBranch# ll
total 16K
drwxr-xr-x 3 root root 4.0K Apr 17 19:46 ./
drwxr-xr-x 4 root root 4.0K Apr 17 19:21 ../
drwxr-xr-x 8 root root 4.0K Apr 17 19:46 .git/
-rw-r--r-- 1 root root   15 Apr 17 19:46 master

testBranch# git checkout dev
Switched to branch 'dev'
testBranch# ll
total 16K
drwxr-xr-x 3 root root 4.0K Apr 17 19:46 ./
drwxr-xr-x 4 root root 4.0K Apr 17 19:21 ../
-rw-r--r-- 1 root root   12 Apr 17 19:46 dev
drwxr-xr-x 8 root root 4.0K Apr 17 19:46 .git/

dev分支下git pull origin dev，把远程仓库dev分支里的代码更新到本地dev分支