The premorbid personality, features of early ontogenesis and childhood crises periods were studied in 226 patients with attack-like forms of schizophrenia, manifesting itself in adolescence with florid psychotic attacks. The authors describe 8 types of the premorbid personality: 1) hyperthymic; 2) sthenic; 3) sensitive; 4) dissociated; 5) passive; schizoid; 6) explosive; 7) model and 8) deficitary personalities. A clinical analysis of the studied cases deomnstrated that the premorbid type of the patient, along with some other factor may be considered as one of the important indices when making a probability prognosis of the development of the disease.