The justified relevance of the further development of the legislative system by deepening its structure, clarity, logical arrangement and systematization. The analysis and generalization of scientific and legislative interpretations of the content of the concepts «legislation» and «legislative system» was carried out. The problems of determining the structure and content of the legislative system are pointed out, which, first of all, consist in differences of opinion regarding the need to include sub-legal normative legal acts in such a system.With reference to the decision of the Constitutional Court, it is emphasized that the option of an extended system is more optimal.By working out the structural organizations proposed by legal science, the legal system is defined as the most common hierarchical (vertical) and branch (horizontal).It is proposed to define a basic hierarchical system in the differentiation of legislation, which allows to fully cover the entire system of legislation and provide a holistic view of it. It is indicated that sectoral differentiation should be formed on the basis of a hierarchical one and serve to ensure in-depth specialization of a specialist in a certain field of law.
 The main elements of the legislative system are analyzed. The effectiveness of codification as a law- making system is substantiated and the need for its further deployment is emphasized. The problem of the legislation is identified, which consists in the presence in the hierarchical classification of a significant number of laws that make changes and additions to the existing normative legal acts in the legal field. It is proposed to further organize the legislative system by distinguishing in it a separate category of primary laws, under which it is proposed to understand the basic, primary acts of the body of legislative power, which regulate basic social relations, have a higher legal force and a normative character, and to which, if necessary, changes can be made. Actual quantitative indicators of categories of legislation functioning in the complex of the legislative system are given.