You can apply for Hong Kong visa through China embassy in Muscat or send application directly to Immigration Department of Hong Kong,
Hong Kong Immigration Department, Employment and Visit Visas Section,
24/F Immigration Tower, 7 Gloucester Road, Wanchai Hong Kong.

Enquiries concerning the application procedure can be made to Hong Kong Immigration department at 00852-2824 6111, or by Fax 852-2877 7711 or through e-mail: immd.gov.hk|enquiry

The following documents are required:

1. A completed Visa Application Form-- ID(E)1003 --, which should be typed and signed by the applicant. Visitors for tourism and business 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 Oman 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 the applicant's full name, position, nationality, passport number and the purpose of the visit, and a copy of the trade license, if self-employed.

4. An invitation letter from the sponsor in Hong Kong (for business visit).

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