what should i do after openid (or twitter ,facebook) user login my site ,on gae
I understand your question.
You wish to be able to maintain a list of users that have signed up with your service, and also want to record users using OpenID to authenticate.
In order to solve this I would do either of the following:

Create a new user in your users table for each new user logged in under OpenID, and store their OpenID in this table to allow you to join the two.
Move your site to OpenID and change all references to your current users to OpenID users.

I'd probably go with Option 1 if you already have this app in production.
Note: More experienced Open ID users will probably correct me!
how to integration local user and openid(or facebook twitter) user ,
did you know some framework have already done this ,
updated
my mean is : how to deal with 'local user' and 'openid user',
and how to mix them in one model .
please give me a framework  that realize  'local user' and 'openid user'