The aim of the study was to determine the predictive value of some types of premorbid state for the development of border-line mental diseases (neurotic disorders and personality disorders). We examined 579 school students and 523 university students. The study comprised two stages: primary examination and follow-up (2 years). Some forms of premorbid mental disorders and their impact on the development of border-line mental diseases were described. The predictive value of different premorbid disorders was estimated.