The purpose of the article is to improve the efficiency of management of agricultural enterprises on basis of a system approach to determine the function of land area usage depending on the profitability level of production and sales. Research methodology. In the research process the following scientific methods have been used: simulation, system approach, analysis and synthesis of information data, calculation. Research results. The research is based on the assumption that the function of development of agricultural enterprises can be determined using system consideration of managerial functions: such as motivation of employees, planning, control, organization, regulation of economic activity through the modeling of technological, organizational and economic changes depending on the conditions of production and sale. The nomogram of the development of agricultural enterprise has been constructed, which allows establishing the correlation of productivity, full production cost, profitability level, land area used in the production and sale, their main features and for a certain period of time. There has been determined the function of their development on basis of modeling of agricultural enterprises' management with increasing of usage level of land area from joint economic activity and usual activity of land area for production and sales by individuals. The efficiency of management of agricultural enterprises has been characterized, comparing the management options in the joint economic activity due to the integrated or separate usage of land areas in production and sales. Elements of scientific novelty. Scientific novelty lies in the difference in the analysis, processing and introduction of economic information in management improvement of agricultural enterprises through modeling, definition of economic indicators of enterprise management, depending on land area, reserved for production. Practical significance. There has been proposed a function of development of agricultural enterprises through system approach in management, which will allow to efficient usage of labor, land, financial resources, and predict technological, organizational, economic changes in the economy. [ABSTRACT FROM AUTHOR]