pakistani national working in saudia and want to visit china and hongkong i have china visit visa

If you want to go to HK, you still need a seperate entry permit to HK, because HK has its seperate immigration system.

You can go to your local Chinese embassy to apply for that, or directly mail all paperworks to HK Immigration Department for application.

where can submited directly hk visa plz send me link

Hey, you can post your application to the following address.
Receipt and Despatch Unit
Hong Kong Immigration Department
2/F, Immigration Tower
7 Gloucester Road
Wan Chai, Hong Kong

If you have further questions, you should make a call at (852) 2824 6111. Personally, I think you should apply from Chinese embassy in your country. If they are able to process your application, you will get it on the fourth or fifth working day. If you apply by post, you should wait four to six weeks.