The purpose of this study is showing the results and issues on approaches focusing on "habits" which make an important role in home education in terms of what a school nurse is required in the school health from now on. This study pays attention to the posture through observing children in the present. The school nurses make a chance to share this problem with the dentists at our school, and fortunately, the dentists make a speech about this problem which the school nurses concerned. Through this event, the school nurse finds the importance of coordinator role. Moreover, the researcher gets a chance to rethink how important health care guidance is because this event can change some student's behavior. In this study, the researcher focuses on getting students "to think of their posture", and corporates with homeroom teacher and asks them to focus on core training during playing.