The purpose of this study was to verify the mediating effect of the tenacity in the relationship between the passion of the university Taekwondo athletes and the continuance intention. Participants were 207 athletes who participated in the University Taekwondo Championships in 2017. these completed the questionnaire to measure passion, tenacity, Continuance Intention The major findings were as follow. First, harmonious passion had a significant positive effect on continuance intention, and obsessive passion had no significant effect. Second, harmonious passion had a positive effect on sub-factors of tenacity. Obsessive passion, however, bad a significant negative impact only on competition. Competition and confidence, the sub-factors of tenacity had significant positive impacts on continuance intention Third, harmonious passion showed significant positive indirect effect on continuance intention via competition and confidence. Obsessive passion had indirect effect of significant positiveness on continuance intention through competition.