Dr Sun's research addresses tourism sustainability, focusing on economic impacts and environmental footprinting. Her work on tourism economic impacts is to use the input-output modelling to provide quantitative estimates on jobs, income and GDP with respect to changes in national tourism policy, market development or special events and disasters. In addition, she also works on the environmental perspectives of travel behaviour, quantifying the tourism carbon footprint and tourism water footprint. She successfully constructed and analysed tourism impacts for individual countries (Taiwan, China, Japan, United States, and New Zealand) and provided the first detailed estimate of the global travel impact on greenhouse gas emissions.