LIU Yuhai is director of Rizhao Environmental Protection Bureau, where he is in charge of environmental protection planning for Rizhao City, environmental management of new projects, supervision of old pollution sources, monitoring of environmental quality and the study of environmental protection technology. He previously held the position of director of the wastewater treatment department in the Environmental Protection Institute of China Petroleum and Chemical Coorperation.

Y. Liu is interested in cycle economy,eco-city building,the technologies for waste water treatment, the relationship between environmental protection and the economy, and sustainable development. He graduated from the Petroleum University of China and participated in English language training courses in Beijing.