Visit visa for hongkong.

Dear Sir/Madam
Hello.
I am a bussiness man & having pakistani passport holder & regular visitor to China since 13 years .
I also have double entry chinese valid visa & want to visit hongkong.
I have also chinese joint venture in pakistan.
so pl. guide me for hongkong visit.
Thanks

Muhammad Inayat Ullah
C.E.O
Nisa Group of Companies.
Islamabad ( Pakistan)