Hong Kong visa is not required for tourists from more than 160
countries. A stay ranging from 7 to 180 days is granted
according to nationality. People from those Hong Kong visa free
countries, however, need to get a HK visa if they intend to
work, study, establish or join in a business there or if their
tour is beyond the granted visa-free stay length. Also, other
countries' citizens have to get a HK visa before leaving for HK
as it's almost impossible to get it on arrival.
Although Hong Kong is a part of China, as a Special
Administrative Region (SAR), it has its own entry regulations.
This means the normal Chinese visa does not work for Hong Kong
and vice versa.
Generally, Hong Kong is very open to foreigners who simply want
to visit as a tourist to conduct business activities for an
overseas business such as visiting clients and prospects,
providing training, or attending trade fairs. Overall, the rules
are essentially the same as under the British administration
that preceded the SAR's return to Chinese control.
Always remember that all countries and Chinese SARs have the
right to refuse entry to any person, whatever the regulations
permit, and that even when you have a visa you can be denied
entry at the border. Also, the information provided here is for
people travelling on standard passports, not special ones like
diplomatic or service passports, nor special or restricted
passports
• have a minimum validity on passport of 1 month beyond the
intended stay, or the duration of the visa may be restricted so
that there will be one month after the visa expiry
• properly complete the immigration card on arrival
• have a visa if your nationality is required to have one
• have onward or return travel arrangements
• have sufficient funds for your stay without working, based on
Immigration's definition, not yours
• no serious criminal records and unlikely to be involved in
crime, nor be considered a security risk
Visitors are normally not permitted to change the type issued or
move from a non-visa situation to obtaining one after arrival
but of course it is easy to exit HK and apply for a Hong Kong
Visa again.
There is full information on the HK Immigration Department
webpage:
http://www.immd.gov.hk/eng/services/visas/immigration-entry-guideline.html
You can get all the forms and the guidelines from the website.