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.lunarpages.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.
And can i setup web users(ex: http://www.lunarpages.com/~dcbuyer/) ?
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.
Can i alias domains to one accout(ex: www.lunarpages.com www.lunarpages.co.uk point to one account)?
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.
The sever is located in LosAngels or Anaheim?I ping http://www.lunarpages.com/ is located Anaheim.But http://www.lunarforums.com/ is located LosAngels.
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.