I am from sri lanka ,but i work dubai i need to vist for hongkong ,what is the produre of applying

Hey, you'd better take the required documents and your original and copy of your residence for employment to apply via Chinese embassy there. If the embassy takes care of your application, you may just wait for around 4 working days. If your application is sent to HK, you will wait 4 to 6 weeks. If the embassy doesn't accept your application, you should send your application to HK Immigration Department directly. It takes around four weeks.

Address:
Receipt and Despatch Unit
Hong Kong Immigration Department
2/F, Immigration Tower
7 Gloucester Road
Wan Chai, Hong Kong