This study was to investigate the effects of behavior inhibition training on executive function of ADHD children. 12 participants, who had high scores in commission error scale of ADHD Diagnosis System, were randomly assigned into either behavior inhibition training group or placebo control group. The subjects of training groups were trained by cognitive test with verbal mediation(used 4 problem solving questions) for 8 sessions and the subjects of control group were trained by cognitive test without verbal mediation. Results of the study indicated that behavior inhibition training significantly enhance executive function than control group. Among executive functions, planning, ability of response-control, and self-regulation of affect were enhanced, but working memory and goal-directed behavioral creativity were not enhanced. Training effects maintained until 4 weeks after the end of the training. Implications of the results were discussed in related with Barkley's Model.