I see that buyjia.com already exists. Are you looking to move its hosting to Lunarpages, or set up a new site? LP used to have incentives for moving from other hosting, but I don't know if they still offer them. You might want to email firstname.lastname@example.org
to discuss specific details.
Can i install PHPBB in your host program?Can it work in traditional chinese version without error or can't type chinese(EX:http://www.buyjia.com/forums/)?
Yes, LP's hosting will support phpBB. If phpBB supports Chinese (labels and prompts I presume; the character encoding would be UTF-8), it should work here.
If i want to upgrade Standard Plan to Premium Plan, i should pay how much setup fee to change plan?
You'll have to ask Sales about that, whether there are any fees to change plans.
If phpBB supports dynamic domains, you'll have to ask LP whether they allow it. If you have VPS or dedicated, it's more likely to be allowed than in a shared server. One thing to keep in mind is that LP doesn't allow you to sell or give away web services to others on a shared server.
You can set up multiple domains on one hosting account ("add-on domains"). They are separate websites with their own files.
Virtual host's control software is cpanel ?
New accounts on Linux (Apache) servers are LPCP (LP's own control panel). Other types of servers have other control panels.
LP has several server sites. I believe that they are moving the Los Angeles data center to Anaheim. There is a Las Vegas data center, and possibly others. They're all in the same region, but not at the same location.