1. It usually resides in %appdata%\gnupg (or C:\Users\%username%\AppData\Roaming); make sure the gpg-agent.conf file has the line enable-putty-support in it somewhere.
2.you have to restart the agent for this to take effect: open a command prompt and run gpg-connect-agent killagent /bye to stop the agent, then gpg-connect-agent /bye should start it again.
3.You can do this by creating a shortcut to "C:\Program Files (x86)\GNU\GnuPG\gpg-connect-agent.exe" /bye and placing it in your Startup program group in your Start menu.
4.pageant ssh.ppk
5.lauch putty session
Reference:
http://www.bootc.net/archives/2013/06/09/my-perfect-gnupg-ssh-agent-setup/
原文：http://my.oschina.net/dangzy/blog/513920