Teaching history of genocides has taken a special place in the school history course. This article describes basic methodological principles of teaching the genocides topic in the school history course. There are defined teacher’s methodical mistakes in the process of teaching the history of genocides. The article is focused in the importance of using cross-curricular themes and different aspects in teaching the history of genocides. There is a based conclusion about the necessity of the organization of teaching the history of genocides from the point of the social psychology. There is a question defined on the comparative teaching of history of genocides.