Teacher research as an international movement since the 1970s has been advocated worldwide to promote school curriculum reform and the professionalization of school teachers. University-school collaborative action research is a new attempt to support school teachers who learn to do research in their classrooms while providing opportunities for university researcher to develop a better understanding of classroom practice with more effective strategies to support teacher change. Such collaborative research has been promoted in the recent curriculum reform in basic education in China. This paper reports on an action research project conducted by school teachers supported by university researchers in the Chinese context with a focus on examining the roles and gains of university researchers in this project. Data was collected through project meeting observations, questionnaires, interviews and participants’ reflective journals. Both quantitative and qualitative analysis methods were used respectively for analyzing the data collected. The purpose of this study is to understand better the nature of such collaborations and the gains as well as challenges on the part of university researchers so that implications can be drawn for establishing a sound university-school collaborative research body that promotes the professional learning of both parties.