✔ 最佳答案
If you think you are going to use the visa more than this time, then renew.
Otherwise, you are good to go.
Unexpired visa in an expired passport is still valid (providing that the visa has not been damaged).
Simply show a current passport and the visa and you are good.
Follow ther website and you know to how to get one:
http://chinese.hongkong.usconsulate.gov/niv_visitor_visas.html
2010-04-20 00:35:41 補充:
Read the link. It is in Chinese.