http://www.scofcom.gov.cn/en/index.htm
Invitation Letter of Duly Authorized Unit How to obtain this Invitation Letter of Duly Authorized Unit?
Invitation Letter of Duly Authorized Unit is a pre-approval document issued by a Chinese Government agency. You will need an inviting company in China to obtain that for you. Please notify your contact in China that you need this form. The Chinese name of this document in Chinese is called: "被授权单位邀请函". You may advise the Chinese inviting company to contact with one of the agencies listed below for details:
Municipal Foreign Affair Office
Municipal Bureau of Commerce
Foreign Economic Relations & Trade Commission
International Trade Promotion Commission
Foreign Trade and Economic Cooperation Bureau
Normally, it only takes 2 days to 1 week to have it approved. You will probably need to submit your passport info or a passport photocopy to the Chinese company.
