The 4th APEC Blue Economy Forum was held in Haikou, People’s Republic of China from June 28th, 2016 to June 29th, 2016. This Forum was sponsored by the Department of International Cooperation of State Oceanic Administration，P. R. China and Haikou municipal Government and organized by APEC Marine Sustainable Development Center/ Third Institution of Oceanology of the State Oceanic Administration, Management Committee of Haikou National Hi-tech Industrial Development Zone and Haikou Municipal Ocean and Fisheries Bureau. Taking “Advancing Blue Economy Cooperation: Pathway and Practice” as the theme, this Forum attracted nearly 150 representatives from 13 member states of APEC economies in Asian-Pacific region, Cambodia, Sri Lanka, Tuvalu and 4 international organizations. The 13 member states of APEC economies included Chile, Canada, China, Hong Kong, Indonesia, Malaysia, Papua New Guinea, Philippines, Russia, Singapore, Thailand, America and Vietnam. The 4 international organizations included Intergovernmental Oceanographic Commission (IOC), the United Nations Development Program (UNDP), World Oceans Commission (WOC) and East Asian Sea Environmental Management Partnership (PEMSEA). This Forum provided a valuable opportunity of communication and a platform of cooperation for government bodies and research centers in and around Asia, and had realized its main purpose and significance- to provide the platform of cooperation and practice for the development of blue economy. The Forum involved a series of issues under discussion including the effective pathways of technical innovation and development of blue economy, successful experience of practice of blue economy, and the conception of advancing the blue economy development and improving the blue economy cooperation with the help of different industries.