The CAS-EurASc Frontier Forum on Marine Sciences and Technologies, co-sponsored by the Earth Sciences Divisions of the Chinese Academy of Sciences (CAS) and the European Academy of Sciences (EurASc), held successfully in Shanghai and online on 20-21 October 2020. The Forum aims to provide a platform for marine scientists and engineers in China and Europe to share their knowledge and experience of frontier research methods and results, and to foster international and interdisciplinary collaboration. The Chairs are Prof. Paul Tréguer, Prof. Louis Legendre and Prof. Jing Zhang. Nealy 60 participants were invited, including scientists and experts from EurASc, CAS, the Chinese Academy of Engineering, and other universities and research institutions, management experts from the National Natural Science Foundation of China, as well as delegates from international projects and academic journals. During the two days, 13 excellent invited talks and discussions have garnered up to 2000 views online from 29 counties in Asia, Europe, Africa and North America. IMBeR International Project Offices provided logistic support to this Forum.