This work is engaged in the reflexis of endangerous of behaviour in the season of adolescence. The first chapter offers a complex, compendious acquainting with life crises in the developement of man with the intention on the crise of adolescence. In conection with this season, there are described fundamental changes that can be the source of critical moments. The second chapter is following up with a critical moments that describes concrete forms of social work with young generation and ethics questions and dilemmas. The third chapter enriches the previous two of the theory of social work that facilitates a daily practise of workers and it specifies for anybody what to do. The last chapter of the work is about the reflex of ethics questions in the social work with adolescence people and their crises and finding the question on it or finding the perspective solutions.