Objectives This paper is to reflect on 25 wonderful years of my collaboration with the Chinese scientists and policy makers on social science and operations research in sexual reproductive health.Past and ongoing collaboration is reviewed,followed by a discussion on the record of achievements and ideas for future directions and research priorities.The paper represents my views based on an exceptionally rich personal and professional experience working with numerous Chinese scientists on a range of research topics.However,it is limited to projects on social science and operations research and training in sexual and reproductive health that have been sponsored by the Special Programme in Human Reproduction,Department of Reproductive Health and Research,World Health Organization (WHO),Geneva.The Special Programme supports research and training,among other topics,on social science and operations research in sexual and reproductive health.As a staff member working in this area,I have had the privilege to visit many countries and to work with numerous researchers all over the developing world.However,China holds a special place for me personally and this paper summarizes my experiences and thoughts. Objectives This paper is to reflect on 25 wonderful years of my collaboration with the Chinese scientists and policy makers on social science and operations research in sexual reproductive health. Past and ongoing collaboration is reviewed, followed by a discussion on the record of achievements and ideas for future directions and research priorities. paper represents my views based on an exceptionally rich personal and professional experience working with numerous Chinese scientists on a range of research topics.However, it is limited to projects on social science and operations research and training in sexual and reproductive health that have been sponsored by the Special Program in Human Reproduction, Department of Reproductive Health and Research, World Health Organization (WHO), Geneva. The Special Program supports research and training, among other topics, on social science and operations research in sexual and reproductive health.As a staff member working in this area, I have had th e privilege to visit many countries and to work with numerous researchers all over the developing world.However, China holds a special place for me personally and this paper summarizes my experiences and thoughts.