Professor Li’s research has focused on epidemiology, public health, and disease prevention and control, with particular emphasis on chronic non-communicable diseases, population cohort studies, and strategic responses to major public health emergencies. Through leadership of national public health institutions and major research initiatives, his work has addressed disease surveillance, large-scale population cohort studies, and the development and evaluation of public health strategies and policies. He has authored numerous peer-reviewed publications in epidemiology and public health journals and has contributed to the training of public health and epidemiology professionals in China. Through sustained research, leadership of national public health programmes, and international scientific collaboration, Professor Li has contributed to connecting epidemiological research with practical approaches to population health, disease prevention and control, public health emergency preparedness, and health-system development.