Two principal stages of V. V. Davydov's creative evolution are marked out: the first of them (beginning in fifties) is based primarily on P. Ya. Galperin's theory; the second one (beginning on the turn of seventies - eighties) is influenced by L. S. Vygotsky's theories. It is shown that V. V. Davydov's scientific findings are based on newly worked out system of notions - interiorisation, forming and development of psychics, general and special, abstract and concrete, personality and creativity.