how to make rsync avoid inputting a password?

[Qu Zhiwei]

Hello

Now I am developing a project. I want abstract rsync from cygwin and use =
it at Windows platform. The problem is when use rsyn -e ssh, it always =
requires a password. So I use ssh-agent/ssh-add, but in command line =
environment, rsync can't reconize the ssh-agent. It still require a =
password once  I use rsync.

Would you please help me to solve this problem?

Zhiwei Qu