The purpose of this study was to examine casual relation among satisfaction, self-expression, and continuing exercise intention through after-school physical exercise class. 406 Y, T, and H elementary school students who live and participate after-school physical exercise class in Seoul were selected as subjects by convenience sampling, and they asked to complete the Affter-school Physical Class Satisfaction Questionnaire, Self-expression Questionnaire and Continuing Exercise Intention Questionnaire. After survey, these questionnaires were analyzed by purpose of the study, and the results were as follows. Firstly, the results showed that there was positive casual relation between satisfaction and self-expression. The satisfaction was similar to self-efficacy, so self-expression ability was improved by its level. Secondly, the results showed that there was positive casual relation between the satisfaction and continuing exercise intention. The satisfaction had close relation with exercise flow, and the continuing exercise intention had direct proportion with these two factors. Thirdly, the results showed that there was positive casual relation between self-expression and continuing exercise intention. if the self-expression ability got improved, the intention, not only exercise but also various interpersonal relation, also could be improved through after-school physical class. In conclusion, the students who had higher satisfaction of after-school physical class got improved their self-expression, so it means that the students needed to participate physical exercise class. The after-school physcial exercise class could improve personality such as sociality, morality, confidence, and etc. of growing children, and it could help to improve interpersonal relation and communication with other people as an important role for the children.