Most countries require international students to apply for a valid students visa (some countries may have different names for this). Please check out the detailed requirements with your host university or with the relevant consulates in HK. Do bear in mind that failure to comply with the entry visa requirements may result in delays, or even deportation. Avoid the stress by paying careful attention to details at this stage.

The contact details of embassies in Hong Kong are listed at this website: http://www.immd.gov.hk/ehtml/embassy.htm