The analysis of special literature has shown that in the conditions of professional training there are many methods of measuring the «Self» of the concept of students as a subsystem of internal development: standardized tests in the form of description and self-description, a list of descriptors, scale techniques, methods of self-description with content analysis, ideographic methods such as repertoire lattices, projective methods. Therefore, the article discusses the possibilities of psychodiagnostic measuring instruments that study the features of the «Self» concept in the process of professional training of students in the conditions of new Kazakhstan. The content of the methods of Budassi, Stolin, H.G. Gough "list of adjectives", Dembo-Rubinstein, L.D. Stolyarenko "self-assessment test", Personal Orientation Inventory, Q-sorting method, Leary's method, the scale of the concept of «Self» Tennessee, "Draw a person" test, thematic apperception test, M. Kuhn test are disclosed and McPartland, Self social symbols Tasks. These methods reveal the features of students in the study of the concept of " Self " and the possibilities of their study, modifications and ways of application. Also, many of these methods were tested by the author in empirical practice during the dissertation research, and the results of the research reflect the effectiveness of these methods. With the comprehensive implementation of the methods, they provide a reliable and valid approach to the study of the «Self» concept of students in the conditions of professional training.