hi I'm Pakistani how will get permit work visa of hk

You should first find a job in HK and then prepare all the required documents including copy of your passport, the application form, a passport-style photo, Photocopy of proof of academic qualifications and relevant work experience.
Your employer needs to provide the application, the employment contract, Photocopy of the Business Registration Certificate, proof of financial standing, documents with details of company background and the detailed business plan.
Afterwards, submit the application to the embassy of PRC to apply for it.