Visa is required for foreigners to enter China. Visit Chinese embassy or consulate in U.S., and submit required documents.

http://www.nyconsulate.prchina.org/eng/lsqz/VisasforChina/t42204.htm

Required documents:

• Application forms
• Documents proving Entry for Business Purposes (Business Plan, etc..)
  
• Invitation letter provided by the hosting institute (Please send request to organizer).
  
• Other material required by the embassy...