This case study is designed to explore an effect of the integrated family therapy on the family with an ADHD child. The purpose of study is to analyze quantitatively and qualitative family counseling data whether there is a significant change on the problematic behavior and family system after performing an integrated family therapy or not. This case includes fifteen session of ADHD child, parents and his younger sister from the tenth of July to the fifth of November 2012. The family therapy takes ninety minutes one session. The data is recorded by video, questionnaire, K-CBCL, KFD, FACESⅢ and parents' depth interview. This study was found to prove the effectiveness of the intergrated family counseling in diminishing problematic behavior of ADHD child and improving family function, including adaptability and cohesion.