The purpose of this study were to investigate the sex difference of the perceived social support and to identify the relation between children s social support and children s adjustment ability. So, It is intended to propose the preliminary data for children s adjustment ability progress program. Subjects of this study were 412 children from the 5th and 6th grades of elementary school. The results were as follows : Sex difference of perceived social support level were partially found. Also, There were significant relations between social support and adjustment. Specially, maternal and peer support levels were most highly correlated to boy s adjustment. Father, mother, teacher and peer support levels were highly correlated to girl s adjustment. In conclusion, children s social support can be recognized as significant variable in predicting the adjustment of children.