Dr. Cheng's main research areas are teacher education and development, science education and assessment for science learning. Apart from being principal investigator of a number of research projects funded by the Institute's research committee and the government's Education Bureau, she leads the Hong Kong Science team to participate in the five-year eleven-nation "Schools Around the World” international project. She is on the editorial board of the Journal of Quality School Education and the online journal, Asia-Pacific Forum on Science Learning and Teaching. She has published four books in Chinese including, Teaching science with a constructivist view of learning - What does it mean in practice?, Developing alternative forms of students' work in science - Raising students' active learning ability, and a series of four educational CD-ROMs titled as Science teaching in Hong Kong - Exemplars of good teaching practices. She also serves curriculum development and examination committees held by the Curriculum Development Institute and the Hong Kong Examinations and Assessment Authority at senior secondary level. She has been invited to deliver seminars to school principals, and university faculties on science education locally, in the Mainland, Singapore and Taiwan.