Li Yuyan, PhD/Associate researcher, Master tutor of Fudan University, Editorial board member, China journal of family planning and obstetrics and gynecology. Mainly engaged in the research of reproductive health epidemiology, including the sexual and reproductive health promotion of all kinds of people, adolescent sex education, and reproductive tract infection/STD/AIDS prevention.In recent years, More than 10 research projects, such as "community-based intervention research on menopause sexual and reproductive health", "sexual and reproductive health counseling training effect evaluation project", " training and effect evaluation projectabout youth health communication way of parent", "youth health education and promotion project", etc. As the main member of the project, participated in more than 10 studies including "birth cohort study on the impact of environmental and genetic risk factors on adolescent obesity" from National Natural Fund and "comprehensive study on the introduction of new contraceptive methods and key technologies of informed choice of quality service for floating population" from the National "12th five-year" technology support program.As the first author/corresponding author, published more than 50 articles, and participated in writing more than 10 books. "China family planning/reproductive health comprehensive counseling capacity building and quality service promotion project" won the third prize of scientific and technological achievements of National Maternal and Child Health Science and Technology Award in 2015 (second ranking). "Comprehensive assessment of health effects based on the phase of youth development" won the second prize of Shanghai Science and Technology Progress Award in 2019(fifth ranking).