This study was to investigate if there are moderative relationships between eco-tourism visit expectation and visit performance, and between visit performance and support of sustainable Eco-tourism development. Recently, a number of visitors for sustainable tourism or Eco-tourism has been increased but a little studies have been conducted to see if how important environmental education for visitors affect their visitor performance and support of Eco-tourism. Based on the literature review, a survey questionnaire was developed and the data collected from on-site survey at three different places in Seoul. Research model and questions were suggested and data analysis was explained, In order to solve the research questions presented in this study, multiple regression and hierarchial regressions were conducted. Findings and implication were discussed in the conclusion section.