This study tried to verify effectiveness of treatments for children who received Early Intervention Service (EIS) for children with problem behaviour. The research evaluated the validity of treatment service in improvement of problem behaviour in the areas of internalizing, externalizing, attention and sociality, and verified differences of effectiveness between methods of treatment. One hundred and ninety seven children participated in this study. They received the treatment services from 5 different branches of H Center, specialized center for emotional and psychological treatment, which was providing EIS on problem behaviour. According to the analysis of pre-post test on problem behaviours, the treatment which EIS centre provided had positive influence on behaviours change of object children, especially Play Therapy and Art Therapy made greater improvement of children’s behaviours. These results suggest the need of continuous study and development in intervention programs related to Play Therapy and Art Therapy.