The purpose of this research is to explore the relationships among junior high students' personality traits, peer relationships, and learning satisfactions on the physical education course. The research participants were students registered in Guanxi Middle School during 2019. 350 valid questionnaires were collected. The analysis was conducted by SPSS and Amos 19.0 statistical software. The results revelaed that: Firstly, junior high students' personality traits had a positive correlation with their peer realtionships. Second, personality traits were positively related to their learning satisfactions on physical education course. Third, peer relationships had positive impact on the course's satisfaction. The findings imply that enhancing the peer relationships among junior high students can contribute to increased the learning satisfactions on the physical education course.