The relevance of the study is conditioned by the fact that social relations require from a school graduator not only the subject specific competences, but also the ability to build interpersonal interaction based on moral norms. Therefore, this article is aimed to reveal the conditions of the school educational environment organization promoting the formation of moral relations among adolescents. The leading approach to consider this problem is a system-activity approach, allowing present structure of the educational environment and the mechanisms of coordination of its elements in complexity. The article presents the results of a study of teenagers' moral relations to be characterized as stable, active, generalized, differentiated, prosocial directed relations. The main conditions of teenagers' moral relations are subject-subject interaction in the context of academic and extracurricular activities, the humanization of the content and technologies of educational process, the saturation by moral facts the subject and space environment of school, meeting social and psychological needs of educational relations participants. The article submissions are of practical value for school teachers dealing with the problem of pupils' spiritual and moral development in school and extracurricular activities.