This article found that at present the system of psychological knowledge about giftedness exists in the form of a concept. The concept is such a system of knowledge organization, which, unlike the theory, does not claim absolute terminological rigor, logical consistency and completeness, reliability and validity of all its provisions. To understand the system of psychological knowledge about giftedness, designed as a concept, the article develops the main methodological principles for studying this concept. As such methodological principles, the following are introduced: the principle of distinguishing between the concept and theory as forms of development of scientific knowledge; the principle of unity of historical and conceptual-logical approaches in the study of the concept of giftedness; the principle of distinguishing the ontological, epistemological and transcendental aspects of the study of the process of formation of the concept of giftedness; the principle of integration; the principle of social responsibility; and the principle of axiological and theoretical consistency.