The objective of this study is to classify the conflict management styles about peers of middle school teachers in actual way and to apprehend the applied inclination of conflict management styles of teachers based on the classification. The result of this study is summarized as follows. First, the conflict management styles about peers of middle school teachers are classified into five types such as integrating, conceding, dominating, compromising and avoiding styles. These results show that those five conflict management styles which this researcher outlined by generating the conflict management styles previously presented by foreign students, are positively verified. Second, the study indicated that the integrating styles is used at the highest ratio and is followed by comprising, conceding and dominating styles, while avoiding styles was used at the lowest ratio. In the aspect of background variable, male teachers had higher rate in using integrating and conceding styles than female teachers; the teachers in the forties or more were more integrative than those in below thirties senior teachers used more integrating, conceding and compromising styles than lay teachers; the teachers belonged to The Korean Federation of Teacher's Associations showed integrating and conceding styles rather than those who belong to The Korean Teachers and Education Workers' Union or no union. But there is no significant difference in the factors of background in dominating, avoiding styles.