The unity of the first gymnasium classes in analysed in the article, the main differences of community unity are revealed in newly formed, formed and partly reformed classes, the differences between girls and boys are revealed on this point. The results of analysis show that the greatest community unito of classes is in newly formed and non–reformed classes.It is most difficult to rally the community in partly reformed classes because it is difficult for new pupils to join the class community which has already been formed.The index of class community depends on the pupils‘ sex. It is larger between boys and less between girls. The emocional index is larger among girls.