Object of research: is a system of economic relations in agriculture and AIC, process of establishing and support of effectiveness of development of new organizing and productive forms of enterprises. The purpose of research: is development of theoretical basis and applied aspects of establishing and development of multistructure in agriculture, estimation of different farming forms effectiveness, forecasting of their further development. Methods: systematical and logical, monographic, statistical and economical, graphic, calculative and constructive, economic and mathematic. Theoretical and practical results: theoretical and methodological basis is formed by fundamentals of economic theory and systematic and dialectic approach as to study of economic processes and phenomena, which have been established in agriculture, establishment and development of multistructure; scientific works, legal and normative acts of Ukraine concerning agrarian reformations. Practical importance of the received results isin fact that their use makes it possible to increase the effectiveness of agricultural production in the region by means of synergetic effect and choice of rational specialization. Research novelty: for the first time comparative estimation of adaptable potential of large agricultural enterprises of organizing and legal forms was made with the use of correlative and regressive model of dependence of the farming results on the level of production concentration; economic essence and functions of personal peasants’ farms under conditions of multistructure of agrarian sector of economy are specified; proposals as to increase of concentration level and production intensification at farms, improvement of their technical equipment, specialization of vegetable, berries and fruits growing, state support provision, proposals to give agricultural enterprises back their priority role under conditions of multistructure are further developed. The degree of introduction: results of the research are accepted for the introduction at Main department of agro industrial development of Lviv regional state administration and are used for the development of Lviv region economic development strategy. Effectiveness: results of the research ground conception of reformation of farming forms in agrarian sector of economy, directed at the increase of agricultural enterprises effectiveness by means of increase of concentration level and production intensification, improvement of technical equipment, state support provision, use of serving cooperatives. Sphere, field of usage: main department of agro industrial development of regional and district state administrations, agricultural enterprises as well as educational process of agrarian educational establishment.
