The purpose of this study was to investigate the therapy progress and play theme of a 8-year old boy with ADHD and anger problem in child-centered play therapy. The child has showed inattention, hyperactivity and impulsivity, and suffered from relational difficulty because of yelling, hitting and anger explosion. The child has taken medication since diagnosed with ADHD. The researcher conducted 42 session play therapy once per week. The results were as follows: First, the child s aggressive and disruptive behavior decreased, and self-regulation improved. Second, examining of the changes of play theme at stage, the play theme of power, control, and abandonment were mainly expressed in initial stage. And then, the theme of aggression, power and revenge were performed. Finally, ego-strenthening and mastery were expressed. The effectiveness of child-centered play therapy was confirmed for a child with ADHD and anger problem. The pattern of play theme was discussed.