Using a qualitative research method, this study describes tourists` beliefs on the sustainable environment of tourism destination. The tourists beliefs were regarded to influence on a direction of tourism development and impacts. With the Critical Incident Technique, the data on the beliefs for the sustainable environment were collected from 150 Korean university students. With a content analysis scheme, all the data were analyzed into four types of beliefs(Rokeach, 1979). It might be interpreted that tourists` beliefs influence on the destination environments through two kinds of paths: directly and indirectly.