The purpose of this study is to examine the level and difference of sport personalitys of middle school students depending on their quality of sport participation. According to prior research(박정준, 2012; Beller & Stoll, 1996), we decided that faithfulness, cooperation, justice and consideration are the sub-components of sport personalities. The reliability and validity of the Sport Personality Index Questionnaire was verified through Cronbach's α test and confirmatory factor analysis. The survey was conducted from students (n=768) in an urban area of Seoul, thereby level and differences of sport personality were analysed by t-test, one-way ANOVA, and frequency analysis. As a result, male students had higher sport personalitys than female, with regard to the participants'grade, frequency and duration of sports involvement. Disparities of gender and grade were revealed due to the frequency and duration of their sports participation. Regarding the effectiveness of sports activities, school-directed sports activities such as the after school sports programs or mandatory sports club activities had barely influenced building sport personality. In order to build students'sports personalities, specific strategies are sorely needed to increase girl's participation and to enlarge opportunity for regular and consistent participation of middle school students. Moreover, in order to develop participants'sport personality within school-directed sports activities, those programs'development and implementation should be deliberately approached with pedagogical intention and organization.
