This study approaches the behavior of school violence as the manifestations of potential dominance in students, analyzes the medium through which dominance is expressed as school violence, and analyzes the influence of the unequal status structure within the class in this process. Dominance is a motive that leads to coercive and self-confident behavior by people with will to power to control their surroundings or the behavior of others. In order for dominance to be expressed as school violence, medium elements that carries dominance and channelizes it are necessary, and this study considered sex, family background, aggression, and popularity as experiences and factors accumulated in the process of life. The structure of unequal status within the class stands for the inequality of the friendships within the class, measured by the Gini coefficient of the input degree centrality of the friendships in the class. This study sampled 841 students in 31 classes in the first grade of five coeducational middle schools located in Seoul. The results of the study showed that sex, family socioeconomic status, aggression, and popularity as mediators of dominance all had a significant relationship with school violence. In addition, it was found that the inequality of peer status in the class further amplifies the behavior of school violence by interacting with family background and aggression. Peer status inequality makes individual students peer status stand out in the class, making the student s position visible. As a result, it distinguishes between popular students and those who are not. In order to prevent school violence, it is necessary to target intervening mediators that carry dominance. In addition, as a structural approach, it is necessary to reduce the disparity of power by reducing the deviation of peer relations for classes whose position structure is hierarchical due to the high degree of inequality in peer relations.