The purpose of this study was to investigate how Interaction-centered group art therapy affected the
social skills and personal relationship of the mentally disabled. The subject were patients with level
3(degrees of disability) disabilities in a psychiatric rehabilitation center. The experiment was conducted over
12 sessions, one hour per week, from September to December in 2014, excluding pre and post tests. The
Social Skills Scale and Social Life Scale were used to measure the objects’s social skills. Relationship Change
Scale and Relationship Function Scale are used to measure the change of personal relationships. The results
are as follows. First, the art therapy positively influenced the social skills. Cooperation and assertiveness, the
subdivision of the self-report Social Skill Scale improved but no significant effect on ego control. There was
a significant effect in the Social Life Scale of observer-report. Second, this therapy had a positive influence
on personal relationships. Satisfaction, trust and openness, the subdivision of self-report Relationship Change
Scale improved but no change in communication, intimacy, sensitivity, and understandability. There was a
change in the Relationship Function Scale of observer-report. Third, confidence and cooperation increase
among patients in the process of therapy. Therefore, the results show that art therapy helps the mentally
disabled to improve insufficient social skills and personal relationships.