The Hong Kong Visa Requirements(https://www.travelchinaguide.com/embassy/visa/hongkong.htm) are:
1. A completed Visa Application Form-- ID(E)1003 --, which should be typed and signed by the applicant. Visitors for tourism are required to submit page A, page A to be continued, and page B, C, D, L.

2. A copy (A-4 size) of the passport and U.A.E. residence visa, both of which should be valid for more than six months and a photograph as in the passport.

3. An employment/no-objection letter from the company, which clarifies your full name, position, nationality, passport number and the purpose of the visit, and a copy of the trade license, if self-employed.

4. Detailed schedule, confirmed hotel reservation and round air ticket booking (for tourism).

6. Original personal bank statement for the last three months.

You can't travel to China on the same visa between your stay in Hong Kong.