Bullying is a growing problem all over the world. It is encountered everywhere and for this very reason it has become a major challenge of the 21 st century to study the psychological nature of bullying and analyze the factors responsible for bullying among the adolescent population.The purpose of the given desk research is to study the psychological mechanism of bullying and identify the factors preventing bullying behavior. The corresponding sources made it possible to view bullying as an integrated system and study its underlying psychological mechanism: the components of the system, the key factors of bullying and their interaction. The research showed significant relationship between the following three factors: personal aggression, the existence of an object of aggression and environmental possibilities. Due to this the psychological phenomenon of bullying is viewed in the context of Anthropic Theory of Set. According to this theory, aggression, the object of aggression (victim) and the environment allowing the person to manifest aggression are the necessary preconditions of bullying.The given work attempts to construct a model of bullying based on the Theory of Set, a model that represents a single system comprising various factors. The article also makes suggestions regarding the further research into the operation of the system in question.