This study attempts to invest the differences in movement coordination between children with ADHD and healthy children using two-way ANOVA. The experimental tasks are divided into simple task and complex task. The goal of the experiments is to study the interaction in hand movements' rhythm, accuracy and error key response between task difficulty and subjects grouping while doing visual-motor integration tasks. The results show that: (1) There are no significant differences in all parameters except error number within group differences. (2) There are significant differences in all parameters except correct response time between group differences.