This study is that how playing the recorder affects the attention and the decrease in the students with ADHD behavior problems. Three ADHD students at Y-elementary school in Y-city were selected as the subjects of this study. This observational experiment was implemented for 20 sessions which kept up 30 minutes for 5 times in each week for five weeks from September 6 to October 8, 2010. The program was reconstructed according to the students' ability and character. The assessment tool was recorded by the frequency of desultory behavior at researcher and researcher's assistant who have observed their behavior in the whole process of experiment - basic behavior, mediation, ex-post inspection, maintain. Also to appreciate the change of the whole behavior in ADHD students, responded specimen t-verification was used to confirm recording of observation to progress of subject students in the experimentation. As the results. first, playing the recorder is very effective on the decrease over desultory behavior of ADHD children. Second, playing the recorder is very effective on the decrease over impulsive behavior of ADHD children. The conclusion of this study through result and discussion are as following. First, playing the recorder is very effective on the decrease over desultory behavior of ADHD children. Playing the recorder showed that ADHD students keep their posture up right long time during playing a tune throughout being in harmony of their heads and hans, and focus on their behavior reducing impulsive behavior like swing their legs and running out of the room as their pleases. Second, playing the recorder is very effective on the decrease over impulsive behavior of ADHD children. They can take how to get stability and reduce their stress from knocking the desk, brandishing the recorder and interrupting the teacher's speaking. The result from the playing the recorder become feedback immediately and evaluate their performance ability on the process of assignment as they can listen to the playing on their eyes and ears. So they can reduce their desultoriness at missing exercise and controling their emotion.