Abstract: To explore the relationship between self-concept and Subjective well-being(SWB )of Middle school students, and also the mediating effects of coping style over the self-concept, 895 Middle school students from 6 middle schools in Sichuan province were selected to fill in Tennessee Self-concept Scale, Simplified Coping Style Questionnaire, China Multidimensional Life Satisfaction Scale for Adolescent and Affect Scales;867 valid questionnaires were retrieved. The results indicated that: Positive self-concept was positively associated with SWB; Negative self-concept was negatively associated with SWB and the coping style partially plays a mediating role in the effects the self-concept exerts over SWB. Conclusion: Self-Concept not only directly affects Subjective Well-being, but also exerts an indirect effect over SWB through the mediation of coping styles.