Thirty probands with the diagnosis of hysterical psychopathy were studied using clinical and genealogic techniques. An analysis of the obtained data made with the help of modern geneticomathematical methods identified a significant correlation between the type of psychopathy in probands and the corresponding type of personality disorders in the first-kin relatives of the probands. The calculated rate of heredity in relation to the risk of hysterical pathology manifestation (in the framework of quasi-permanent multifactor model) (79.9%) suggests that the formation of hysterical psychopathy is to a considerable degree determined by genetic mechanisms.