Professor Jiang’s research has focused on demography, population economics, and systems engineering, with particular emphasis on population policy, sustainable development, and the application of systems analysis to socio-economic planning. His academic and policy work has addressed family planning, population ageing, and the integration of demographic analysis with national development planning. Through his involvement in national population policy and international demographic research, he has contributed to the application of demographic and systems approaches to population planning and socio-economic development in China. He has authored numerous peer-reviewed publications and policy reports and has participated in academic and policy research on population and development. His work has also involved international scientific collaboration and engagement with questions concerning population structure, demographic change, and sustainable development. Collectively, his academic and public-service career reflects a sustained engagement with the application of demographic and systems science to population policy, socio-economic planning, and broader questions of national and social development.