For conference participants who need a visa to enter the People's Republic of China, please complete the visa related section of the online conference registration form from the conference web page and the direct link is http://ribll.impcas.ac.cn/conf/ocpa6/. The conference organizers will mail you a letter and a completed form for your visa application. Please check the webpage of the Chinese Embassy or Consulate in your country to see whether you need a visa or not to enter China.