This study purposed to investigate the effects of play activities with cognitive behavior therapy on child's perception about parental divorce, and self-esteem of a child who experienced parental divorce. The subject of this study was one case with 9 years(female) referred by social worker, who observed her and found her having problematic belief due to parental divorce and showing some problematic behaviors such as aggressiveness, stubborn, a transparent falsehood. Change in the child's perception about parental divorce was measured using The Child's Beliefs About Parental Divorce Scale, Self-monitoring, Thought-Sheet before and after the treatment. And change in the child's self-perception was measured using Hare Self-Esteem Scale before and after treatment. It was consisted of 10 sessions, twice in a week, 60 minutes for per session. The result of this study were as follows: First, child's perceptions about divorce that is about desertion, self-blame, fantasy of re-union was changed positively after treatment. Second, child's perceptions about self and self-esteem was changed positively after program.