The Fourth International Conference on Intelligent Science (icis2020) will be held online on the j-meeting platform from February 24 to 27, 2021. This conference is sponsored by Chinese Association for Artificial Intelligence and Chinese branch of international information research society, hosted by Durgapur National Institute of technology and CAAI Intelligence Science  Professional Committee, and co sponsored by International Federation of information processing (IFIP). 80 delegates from 12 countries attended the online conference. With the theme of "the Age of Intelligence has come", the conference deeply discussed the problems of intelligence science and technology, and exchanged the current research on artificial intelligence and human intelligence. There are 7 keynote addresses, 17 invited lectures and a special forum on the challenge of intelligence science.