"The purpose of this study is, by the method of meat-analysis, to integrate and analyze the data for the effects of adolescent art therapy. To do so, a total of 41 academic theses for Master's and Doctrate degree were collected in the way that the chosen theses must be about adolescents and analytic methods involved in the theses must include pretest, posttest, and comparison between them. The results from the study are as follows. First, the general trend of the theses collected shows that there have been 20 Master's theses in graduate school (48.8%), 10 general theses (24.4%), 32 theses (78.6%) about adolescents, 25 theses (62%) about middle school students, and 16 theses (39%) about group therapy with over 10 group members. As to the number of sessions, 12 theses (29,3%) are performed with 12 sessions; 12 theses (29.3%) have 90 minutes per session; 18 theses (43.9%) have one session a week, and 19 theses (46.3%) are written by art therapy majored writers. Second, The average effect size as a whole is 0.63. Third, there has been no significant difference in the effect size of art therapy program participants and in therapeutic methods. Fourth, as to the factors toward the purpose of art therapy, the effect size for ego-concept shows a significant statistical difference. Key Words : Meta-Analysis, Adolescent Art Therapy, Effect Size "