The 4^th Sino-Sri Lanka Workshop on the Cooperation of Marine Science and Technology was held from July 2^nd to 4^th, 2019, Hangzhou, China. CEng. E.A.S.K.Edirisinghe, Chairman, Eng W.N.M.Zoysa, Director General, Dr. K. Arulananthan, Principal Scientist, Dr. W.N.C. Priyadarshani, Senior Scientist of NARA, Prof. Daji Huang, Deputy Director, Jiangning Zeng, Deputy Director of Department of Science & Technology of SIOMNR, Prof. Dongxiao Wang Director of the China-Sri Lanka Joint Centre for Education and Research, Prof. Yan Du Deputy Director of the South China Sea Institute of Oceanology participated the event to discuss about the cooperation in establishing the Sino-Sri Lanka Joint Observation System for Marine Environment and Ecological Disasters of coastal area.