In the era of education reform in Hong Kong, on various government documents, different concepts and functions of assessment were introduced to the community. The importance of formative assessment was emphasized. This paper aims to study the student teachers' implementation of formative assessment in General Studies lessons during their teaching practise. Commonly used assessment methods, alignment of learning and assessment activities, student teachers' intervention after receiving feedback from pupils, difficulties encountered, perception of the student teachers on formative assessment and pupils' feedback are reported in this study. It is hoped that the study will provide insight into the practice of formative assessment in primary General Studies classrooms as one aspect of the professional development of General Studies Teachers.[Copyright of Hong Kong Teachers' Centre Journal is the property of Hong Kong Teachers' Centre at http://www.edb.org.hk/hktc]