Hong Kong has completely separate immigration from mainland China. Your Chinese visa means nothing there, it's as if they were separate countries. However, Hong Kong allows many nationalities visa-free stays of 14 days or more. Others need to get Hong Kong visas. When you don't mention your passport, nobody can give you an accurate answer. This might give you a better idea:
http://www.immd.gov.hk/en/services/h...ry-permit.html