前提是已经安装好git flow并做好配置。安装指导

1 首先确定你的紧急发布应基于那个分支（默认是mater/main分支,）并切换到对应分支。
2 git flow init--该命令会只指导你基于那个分支创建hotfix分支，你的hotfix分支自动合并到哪些分支提示如下    

Branch name for production releases: [master]
Branch name for "next release" development: [develop]

How to name your supporting branch prefixes?
Feature branches? [feature/]
Release branches? [release/]
Hotfix branches? [hotfix/]
Support branches? [support/]
Version tag prefix? []
3 git flow hotfix start 分支名（不要加hotfix）--新建hotfix分支，成功后会自动切换
如下
   git:(develop) git flow hotfix start testHotfix
切换到一个新分支 'hotfix/testHotfix'

Summary of actions:
- A new branch 'hotfix/testHotfix' was created, based on 'master'
- You are now on branch 'hotfix/testHotfix'

Follow-up actions:
- Bump the version number now!
- Start committing your hot fixes
- When done, run:

     git flow hotfix finish 'testHotfix'
4 在hotfix分支修改代码然后add和commit
5 最后执行git flow hotfix finish 分支名