The purpose of this study is to investigate the group art therapy for the improvement of adaptative behavior and lessening of daily stress on children of single parent. For this purpose, data was gathered from experimental group and control group of 6 children of single parent who are ranging from 4th grade and 6th grade of elementary school from child centers in region H and region W in I City. For experimental group, a total of 20 times of group art therapy program was performed which was composed of 1-2 times a week, 100 minutes for each including pre- and post-test from December 4, 2009 through March 2, 2010, and no group art therapy program was applied to the control group. For research tools, it had the adaptative behavior scale and K-HTP test for measuring the adaptative behavior, ordinary stress scale and PITR test to measure the daily stress. In order to undertake the result analysis, SPSS ver 15.0 was used to implement the non-parametric statistics method in Wilcoxon signed-ranks test and Mann-Whitney U test, and the K-HTP test and the PITR test had the qualitative comparison and analysis. The results of the study are shown as follows. First, the group art therapy showed the improvement on adaptative behavior of children in single parent families. And, second, the group art therapy showed the reduction in the daily stress on children of single parent families. Therefore, the study suggests that the group art therapy on children of sing parent families would be needed to preventive delinquent behaviors as well as needed for therapeutical level.