Can you tell me the required documents for business visa?

For business visit, you should prepare following documents:
1. Original passport and a photocopy of its pages with personal information.

2. A fully completed Visa Application Form with your signature.

3. An original letter from your employer. It should contain your name, nationality, occupation, purpose of the visit, the planned date of entry and financial conditions.

4. An invitation letter from the Chinese side (original or a photocopy/fax).

5. A passport photo with white background.

6. A photocopy of a valid residence permit in Saudi Arabia.

Fee is Riyals 120 for a single entry. But you need to apply through either of the two agencies listed above.

dear sir,is there any special stamp must be found on bussiness invitation required to issue bussiness visa to china from jeddah?many thanks in advance.

Yes, the letter should include stamp of the inviter's company or related department.