Abstract: The assessment of influences of planning on environments is a process of monitoring,analysis and evaluation of the environmental impact.It is one of the effective methods to cope with uncertainty planning.The research on environmental impact assessment of ecotourism planning is still very rare at present.In this study,taking the ecotourism planning of Tangjiahe National Nature Reserve in Sichuan Province for example,the research and discussion are conducted on the purpose of tracking environmental impact assessment of ecological tourism planning,technical route,evaluation content and tracking environmental impact assessment of protected areas for the future sustainable development.