Object: the development of economic relations in environmental neoinstitutional based economic theory. Methods: provision of modern institutional theory of economic and ecological theory, theory and methodology of environmental economics. The paper used a systematic approach to the study of economic and environmental institutions, economic and environmental transaction market administrative decisions in the sphere of nature, the method of economic-environmental discourse, economic, statistical, economic and linguistic method; logic synthesis, analysis and comparison. Theoretical and practical results. The theoretical framework, methodological principles of formation of neo-institutional mechanisms of environmental economics in terms of transformation of economic and ecological systems, scientifically based and methodically completed recommendations for system forming a system of neo-institutional mechanisms of environmental economics are developed. Novelty. The concept of economic relations in environmental management based on economic theory and neo-institutional co-evolution of basic theoretical concepts (pillars) economic-legal relations, economic relations of property, contractual relations and economic and environmental transaction opportunistic behavior by analyzing of categorical basic and functional links between these categories and conceptual approaches to the management of economic and environmental transaction of the using of economic-environmental discourse, market institutions of environmental economics and institutional design of economic and ecological systems are developed. Degree of implementation: Ministry of Regional Development and Construction of Ukraine (letter number 20-10 / 27/10 / 6-10 from 12.10.2010), Expert Council of the Ukrainian part of Committee on cooperation between Ukraine and the EU (letter number 41 of 22 October 2010), State environmental Academy of Postgraduate education and management (letter number 810 of 08.12.2009), Ministry of Environment and natural resources of Ukraine (letter number 17058/09 / 10-11 from 09.09.2011), Odessa Regional administration (decision number 7/1 on April 8, 2009), Lviv Regional Management of Water Resources (letter number 03/2868 from 29.10.12), a research institution "Ukrainian Scientific Centre of Ecology of the Sea" (letter number 359 / 6 of 10.8.2013), Department of environmental safety of Odessa city Council (letter №1685 / 1 on 26.12.06), Agency for development programs of Odessa (letter dated 17.03.11), National Institute for Strategic Studies (letter number 01-12 / 78 of 23.12.2011), Centre for Regional Studies (letter number 06/04/08 of 10.04.08). Scope . Economics of Nature Use and Environmental Protection.
