The purpose of the article is to substantiate key provisions of the institutional theory of development of the agrarian market, to find out national peculiarities and regularities of formation of the agrarian sector of economy, and to provide substantiated practical recommendations on the usage of tools for an implementation of socio-economic contradictions in the agrarian sector of Ukraine. Research methods. In the research process of research have been used general scientific and special methods, methodological and conceptual provisions of modern economic theory, in particular: monographic method (scientific works of domestic and foreign scientists on problems of development of the agrarian market and institutional imperatives of its stability); methods of scientific abstraction, interconnection and development; institutional and evolutionary approaches for a study of nature and content of socio-economic contradictions in development of the agrarian market, as well as their key features. Research results. Theoretical generalization and approaches to solution of socio-economic contradictions in the system of agrarian relations have been proposed. On this basis have been developed proposals on institutionalization of the agrarian market of Ukraine in conditions of dynamic changes in its structure by ownership forms. It has been found that the state should influence the formation of structural and institutional forms of development of the agrarian market by establishing appropriate rules that proved their effectiveness in foreign countries. Elements of scientific novelty. Identification of socio-economic contradictions in development of the agrarian market in the EU countries and identification of opportunities for using successful experience in their implementation in Ukraine have gained further development. First of all, they must include introduction of the agricultural land market through institutionalization, as well as formation of “new” institutions of functioning of the agricultural sector aimed at increasing its efficiency. Practical significance. In order to implement socio-economic contradictions in development of the Ukrainian agrarian market, it is necessary to pursue a reforming policy of the agrarian sector, taking into account achievements of the latest theories of institutionalism, based on the prospects for a formation of stable agro-industrial chains of value added. Figs.: 1. Refs.: 34