The purpose of this study is to investigate the change of psychological well-being by experiencing the school excursion. Questionnaire for actual proof analysis was developed based on Ryff's PWBS(Psychological Well-Bing Scale) and Data were collected from 215 highschool student. This study carried out descriptive statistical analysis, reliability analysis, factor analysis and t-Test with SPSS(ver.15.0). In the result of factor analysis, psychological well-being was classified with five factors; relations with others, self acceptance, personal growth, autonomy and environmental mastery. Result of paired t-test demonstrated that differences of psychological well-being between pre and post school trip. Meaningful differences were shown in 'relations with others(p=.000)', 'self acceptance(p=.013)' and 'self-assurance(p=.000)', whereas 'personal growth' and 'environmental mastery' were not significant. These results imply that the school excursion is instructive for youth. Based on these findings, the implications limitations of the study were also discussed.