Hello sir im need visa hong kong, Im pakistani wark in ksa saleman

Muhammad, what is your purpose to HK? If you go there for tourism purpose, you can apply for a tourist entry permit. You should first prepare the relevant materials including copy of your passport, the application form, a recently-taken passport-sized color photo, proof of your financial support, hotel reservation, flight itinerary and your travel plan. And then post the application to HK immigration department to apply for it.
Below is the postal address:
Receipt and Despatch Sub-unit
HK Immigration Department
2/F, Immigration Tower
7 Gloucester Road
Wan Chai, HK