The article reflects an actual theme for modern society: aggressive behaviour at preadolescents, behaviour, which can affect their integrity and psychological security. The detailed analyses of the experimental research in which were include 126 preadolescents from urban and rural environments allowed us to highlight that for nowadays preadolescents are particular aggressive behaviour, behaviour which can cause physics and moral harm to children, psychological discomfort, negative feelings, tensions, fear, depression. It is also behaviour of annulment of the child freedom of expression or action. The aggressive acts can offend the child’s dignity in a way that he remains injured or traumatized for life. It is important to teach children to express their negative emotions in a less traumatic way and the ability to react and defend themselves from the aggressive behaviour of others.