Abstract: The article presents the results of teenagers' social aggression research. The most important is the influence of singnificant, personality forming factors. Thus the mistakes in developmental psychological and pedagogical work with children determine manifestation of aggressive personality. The forms of social, biological and individual determination of behaviour play a significant role in teenager's personality sociogenesis. Psychical features of personality and its condition during the process of sociogenesis are flexible and unstable. The methodological base of the research contains the up-to-date achievements of epistemology. The author uses theoretical and general philosophical methods (dialectics, system approach, analysis, synthesis, analogy, deduction, observation, modeling), traditional juridical methods (formal logical method), and methods used in special sociological research (statistical method, expert evaluation, etc.). Therefore the breaches of the process of aggressive patterns of behaviour formation can occur. There are initial features in this process which can be called prior deviant. These are social phenomena, personality features and social situations, violating the normal process of personality formation and threatening its harmonious maturing. But one has to keep in mind that the processes of socialization and sociogenesis are in methodological correlation, being linked to each other and at the same time directed at the formation of personal individuality.