Thus this study aims to examine the effect of child-centered group play therapy on improvement of young children's self-esteem and sociality targeting 3-5years old (Korean age) general young children. The present study is nondirective and nonstructural child-centered group play therapy and is different from preceded directive and structural group play therapy program. Ultimately eight young children were selected and they were divided into two experimental groups of four children with considering their gender and age. The childcentered group play therapy was performed for experimental group twice a week, 15 sessions in total. According to the result, First, the child-centered group play therapy significantly changed overall self-esteem and subordinate factors which were cognitive ability, physical ability, peer acception and mother acception. Second, child-centered group play therapy showed significant changes in overall sociality and autonomy area. Third, during the process of sessions, child-centered group play therapy showed positive change in behaviors that indicated self-esteem and sociality.