The study of issues of development and modernisation of the existing structure of economy is central to the scientific activity of the Republic of Kazakhstan. The purpose of the study is to consider the trends in the development of the economic system in the territory of the Republic of Kazakhstan. The study used methods of analysis and synthesis of information, the comparative method, induction and deduction and analysis of research papers, which is relevant to the subject matter. The conclusions were drawn that the modernisation and development of the economy of Kazakhstan is a complex step-by-step process, which includes: mastering the manufacturing of modern products; renovation of production equipment; organic integration into the latest world innovation processes; requalification of people. The practical significance of the study is that it can be used by theorists and practitioners to investigate the development of the economic system in the Republic of Kazakhstan.