Dear sir,am a nigerian engineer,i have a conference in hong kong next month by 13 - 18 october. Plsr

The first thing is to prepare the required materials: a completed application form, copy of your passport, a half-length color photo, proof of your financial support, transportation and accommodation arrangement, and an invitation letter from the conference organizer.
The next thing is to submit the application to the embassy of PRC between 15:00 and 17:00 every Tuesday or Thursday to make an appointment for the interview and submit the application. Or post the application to HK immigration department to apply for it. Here is the postal address:
Receipt and Despatch Sub-unit
HK Immigration Department
2/F, Immigration Tower
7 Gloucester Road
Wan Chai, HK