The study investigated the relations between student extracurricular activity involvement, general self-concept and student leadership on middle schools students, by using Harter' s perception scale and self-made student leadership questionnaire and student extracurricular activity involvement questionnaire. The results show that there was s significantly positive correlation between student extracurricular activity involvement and student leadership, and the general self-concept play the role of mediator. Besides, general self-concept was a p...