I want to go hong kong so how can i get tour visa..

Sang, the first thing is to prepare these materials: copy of your passport, your financial support proof, application form, a passport-sized color photo, proof of your transportation and accommodation arrangement, and your travel plan to HK.
The next thing is to post your 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