Recently, school teachers find new types of hard handling students. They do not always do illegal behavior, but they make some troubles. However, it is difficult for teachers to manage them. The purpose of this research is to identify what kinds of strategies teachers use to build good conduct for hard handling students. Sixty four elementary school teachers and fifty nine middle school teachers were participated in this research. They answered questionnaires with high quality text data about copying styles against these students. We analyzed them by text data mining method with word miner in four levels of teachers' career and in the diff erences of elementary schools and junior schools. The results are as follows: Teacher use the strategies, such as, 'addressing to her/him,' making good relationship with her/him' for the most difficult managing students. Additionally, in the case of hard handling students, teachers make closer relationships with other teachers, parents and the principal. We also found the differences of strategies according to careers; young teachers are used to keep out of her/his problems, on the other hand, elder teachers use to some strategies, for example, giving her/him some responsibly to encourage doing good thing and trying to manage them by themselves against their problems. In elementary school, teachers ask their principle to help them; on the other hand, in middle school teachers asked other teachers to help them. We discussed how we establish richer strategies to build good conduct of hard handling students in Japan.