The purpose of this study was to examine the effect on interpersonal relationship disposition, self-resilience, and self-achievement of adolescent participants in cross-country trip. The expression disposition and social relationship disposition were found to have a significant effect on self-achievement, regarding the effect of interpersonal relationship disposition on self-achievement. The interpersonal relationship disposition was found to have a significant effect on expression disposition, role disposition, and social relationship disposition in connection with the effect of interpersonal relationship disposition on self-resilience. Meanwhile, self-resilience was found to have a significant effect on positive future orientation, diversity of interest and attention, and emotion control in relation to the effect of self-resilience on self-achievement. Those results suggest that adolescents tend to attempt to make self-expression properly in order to maintain amicable interpersonal relationship with others during their participation in cross-country trip. In other words, they attempted to remember the praises shown by others to them and avoided prejudice, if possible, and tended to try to understand others in their interpersonal relationship. Moreover, they articulated their opinions clearly to express themselves and engaged themselves in behaviors attracting the attention of others, and attempted to seek compromise rather than conflict. Particularly, in connection with the effect of self-resilience on self-achievement, adolescents strived to have hopeful and optimistic view of their future, made efforts to achieve goals, took on challenges with interest towards various experiences and amusing things, and exhibited patience in the face of difficulties, and maintained calmness through emotion control. It would be necessary for government ministries related to adolescent affairs to proceed vigorously with policies and programs conducive to promoting various physical activities and sports activities designed for adolescents. In addition, relevant organizations would need to play supervisory role thoroughly in verifying safety educations or programs and making sure that professional manpower is secured.