He is widely known for his research on the preparation, properties and behavior of new kind of coagulants/flocculants in water and wastewater treatment. Up till now, Dr.Gao has published 809 peer-reviewed papers in the high-impact national and international journals, and has received 28 awards from international, national, ministerial and provincial government and obtained 94 patents for the chemicals and technology for water and wastewater treatment. Among 809 peer-reviewed papers, 568 papers are SCI - indexed papers, the total SCI citation is 20215, and h-index is 67. He is currently a member of International Water Association (IWA), the member of Chinese Society of Environmental Science; deputy director of the Industry Water Treatment Branch, Chemical Industry and Engineering Society of China, etc.. Currently, he serves on the editorial board of 15 national and international journals, including “Journal of Environmental Sciences-China”, “China Environmental Science” and “Environmental Science”, etc. He was honored as the Highly-cited Scholar of China by Elsevier in 2014,2015,2016,2017, 2018 and 2019.