Sorry about the *late* response

I can't see your screen shots, I must be missing a plugin in my mail client
>  
> 1st, What dose SSO user mean in the Jetspeed2?

SSO can mean integrating with a single-signon identity management system 
external to Jetspeed

http://portals.apache.org/jetspeed-2/deployguide/config-sso.html

or it can mean Jetspeed's lightweight built-in SSO described here

http://portals.apache.org/jetspeed-2/adminguide/sso.html

>  
> 2nd, what’s the relationship of SSO user to portal login user?
>  

In the second case, the SSO User is associated to the Jetspeed user by an 
association stored in the database (1..many) and managed with the SSO 
Management portlet 

> 3rd, what’s the relationship of SSO user to login user of SSO site?

A logged in user can be associated with 1..many external accounts

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