what are the documents i should present before apply for China visa?

You need to go to any of the two companies to submit documents to apply for China visa. The address, contact information and office hours of the two companies are as the following:

Chinese Competitive Spirit Co.
Address: OLAYA DISTRICT 62TH STREET, SADA 1 BUSINESS CENTER
Telephone Number: 01-4621258, 0501086100
Fax Number: 01-4633850
Office Hours: 8:30 am－2:00 pm, Saturday to Thursday.

Al Sandross International Est.
Address: BIN SALEM TRADING CENTER, TAKHSOSSI STREET (200m North to the Emirates Airlines Office)
Telephone Number: 0535363247
Office Hours: 8:30 am－1:30 pm, 5:00 pm－9:00 pm, Saturday to Wednesday, 8:30 am－1:30 pm, Thursday.

I don't know your purpose of going to China, so I can't tell you the required documents.