Based on resource-based theory and theory of planned behavior, this study aims to explore potential visitors' behavioral intentions to ecotourism and the interaction relations among variables of perceived environmental involvement, ecotourism support, as the mediators, and behavioral intentions, as the dependent variable. Selecting ecotourism in Sichuan Province for the research, the visitors proceeded to fill the questionnaire survey, from the potential visitors' point of view about ecotourism. A total of 348 valid copies were retrieved for the analysis of parameter estimation. They reveal positive and significant effects of visitors' innovation and interests on perceived environmental involvement, visitors' interests and perceived environmental involvement on support, as well as visitors' perceived environmental involvement and support on behavioral intentions. It is further discovered that "interests" play the key factor in driving the intention of visitors' future selection of ecotourism products. The research results provide suggestions and reference for related units in Sichuan Province developing and promoting ecotourism.