The article argues that from the point of view of diachronic approach, professional socialization of a university student in the university educational environment can be viewed as a life stage when he/she becomes an active subject of the professional development process. 154 professors from three Saratov educational institutions of higher learning and 54 students from the Department of psychological, pedagogical and special education of Saratov State University took part in the empirical study. Researchers used a set of methods: polling, O. V.
