How to apply for business visa and what’s the cost for nepali citizen ?

You can apply for a business visa at the Chinese embassy by submitting the following documents:
(1) Passport, application form, and recent photo
(2) Documents on the commercial activity issued by a trade partner in China, or trade fair invitation or other invitation letters issued by relevant entity or individual

For first-time applicants, the following documents are also required:
(1) Recommendation letter from the sending Nepali company
(2) Company registration & PAN registration
(3) Personal or company bank statement of the last three month

The cost for a single entry visa is 2,200 Rs.