Hi,im Myanmar National with uae residence visa,i want to go to HK,where can i apply?

You can submit your application to Chinese embassy or consulate in UAE with your passport and UAE residence visa. BTW, invitation letter from HK and inviter's HK ID are required if you are going for business. The application may need to be sent to HK Immigration Department for approval, so it takes time about 4-6 weeks. It is not necessary to use agency as they may charge much for their service.