The purpose of this study was to examine the effect of a group art therapy program based on positive psychology on the interpersonal relationship of university students. To conduct this study, 10 students, scoring less than a -1 standard deviation of the average on the Relationship change Scale(RCS) test for students who are attending a university in Chungbuk area, were randomly divided into an experimental group and a control group with five students in each group. The experimental group underwent the group art therapy program based on positive psychology for 90 minutes each session, once a week for a total of 10 sessions. As the tools for the effectiveness measurement of program, the RCS developed by Schelin and Guerney(1971) and translated by Moon Sun-Mo(1980), and Kinetic School Drawings(KSD) developed by Song Myung-ja(2010) were used. For statistical processing, t-test was performed by using SPSS 18.0. The results were as follows. First, the experimental group more significantly improved the post test score of RCS and KSD than the control group. Second, there was a positive change in the responses of KSD as a result of the group art therapy program for university students. In conclusion, the group art therapy program based on positive psychology is effective for improving interpersonal relationships of university students.