Abstract: The environmentally friendly behavior of tourists is of great significance to the environmental protection and sustainable development of tourist destinations. The fit of tourism environment and local attachment have an important impact on the environmentally friendly behavior of tourists. Based on the tourism environment fit degree theory, this study uses the world heritage site Wulingyuan as the data survey place, and through a questionnaire survey of more than 1 000 tourists who are or have been traveling in Wulingyuan,, AMOS structural equation model is used for multilevel hypothesis test and intermediary effect test, to clarify the impact mechanism of tourism environment fit on tourists’ environmental behavior. Study has shown that the direct influence of tourists ’environmental compatibility on tourists’ environmental behavior is not significant. The degree of tourism environmental fitness positively affects local attachment, and local attachment also has a positive impact on environmentally friendly behavior. Local attachment plays an intermediary role between tourism environment fit and pro-environmental behavior. Based on these, it puts forward management suggestions to the scenic spots of the heritage sites, guides tourists’ environmental-friendly behavior, and promotes sustainable tourism development.