This study is aimed to explore the relationships between visitors' characteristics and their environmental attitudes toward ecotourism. The concept of environmental attitude includes environmental ethics, environmental education, and sustainable development. According to factor analysis, the variables of environmental attitudes toward ecotourism are labeled as six dimensions that are leaning from environment, obligation on environment, affection on environment, consciousness of environmental crisis, visual enjoyment, and technique for improving environment pollution. Followed by the method of cluster analysis, the visitors are classified into environmental responsibility, environmental learning, and generalist three environment-attitude types. The results show there are relationships between the visitors' characteristics and the types of environment-attitude through the chi-square analysis.