The purpose of this study was to examine the effects of coping behavior in interpersonal relationships of adolescents with communication disorders. They had experienced interpersonal skills among the same age children through a "Mokumoku group". We compared Child Behavior Checklist(CBCL) before with after graduation of "Mokumoku group", we found some changes in the CBCL scores. As a result, through to joining "Mokumoku group", without having aggressive behavior, they can tell their feelings to others, and intervention of group's therapists can reduce their problems of sociality and attention. On the other hand, for those who had the problem of social possibility in the same age's communication, they may have a problem such as "depression anxiety'', "withdrawal", "delinquency".