1.首先打开Git Bash设置名字和邮箱：
git config --global user.name "你的名字"
git config --global user.email“你的邮箱"
2.删除.SSH文件下的known_hosts(.SSH在C:UsersWindows用户名目录下)
3.生成ssh公钥认证所需的公钥和私钥文件
ssh-keygen -t rsa -C "你的名字/你的邮箱"
然后会出现以下内容
Generating public/private rsa key pair.
Enter file in which to save the key (/c/Users/Administrator/.ssh/id_rsa):
/c/Users/Administrator/.ssh/id_rsa already exists.
Overwrite (y/n)? y（输入y）
Enter passphrase (empty for no passphrase):（回车）
Enter same passphrase again:（回车）
然后系统会自动在.ssh文件夹下生成两个文件，id_rsa和id_rsa.pub，用记事本打开id_rsa.pub，将里面的内容复制到下面这里
4.在Git中输入ssh -T git@github.com验证与github连接是否成功时
The authenticity of host 'github.com (13.250.177.223)' can't be established.
RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
Are you sure you want to continue connecting (yes/no)? yes（输入yes）
Warning: Permanently added 'github.com,13.250.177.223' (RSA) to the list of known hosts.
Hi XXX! You've successfully authenticated, but GitHub does not provide shell access.
最后再试着拉取一下项目，就成了。。