You can apply for a China business visa from Chinese embassy in Oman, the requirements are as follows:
1. Original Visa Notice Sheet from an authorized governmental apparatus /organization inChina prescribing the visa validity, number of entries and stay period;
2. Fully completed Visa Application Form in Chinese or English, attached with one of the your recent color photograph.
3. Original passport with validity more than six months and minimum 2 blank visa pages;
4. Photocopy of the first 2 pages (personal information) of the passport and the recent Chinese visa page if there is any;
5. Invitation letter from the company/organization/institution you want to visit in China;
If this is your first visit to China, it is recommended that following documents are also prepared in case of necessity:
1. Your income certificate/up-to-date Personal Bank Statement
2. Your company's Registration Certificate (photocopy)
3. A recommendation letter from your company/organization/ institution
4. A recommendation letter from Chamber of Commerce& Industry
5. Your Tax Payment Receipt for last year (photocopy)
6. Your Character Certificate/Police Clearance Certificate