The study on the classification of ecotourism resources is important in the field of ecotourism research. The overseas study in this field started in 1960 s, and it can be divided into three stages: exploration stage, the rapid development stage and the stage of consolidation and innovation; while the domestic related research in this area began in the middle of 1990 s, which can be divided into initial, prosperous and stagnant stages. On the whole, the research on the classification of ecotourism resources has gradually formed the trend of th...