Hi guohong. I have sent an e-mail message to your e-mail address about your lost contacts.
For your lost Messenger contacts, Windows Live Messenger Support can best help you with this. Here's how to contact them:
1. Visit: http://windowslivehelp.com/solutions/newvisitor/archive/2009/02/04/how-to-get-support-for-your-non-hotmail-products.aspx
2. Click the link under "Windows Live Messenger".