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Ecological sustainability - ability of ecological system to keep the properties and parameters of modes in conditions of operating internal and external indigations. Quite often ecological sustainability is considered as a synonym of stability. With increase of anthropogenesis influence to the environment the urgency of development of adequate systems of nature protection actions increases. During optimization of quality of an environment there is a problem of an estimation of ecology-economic efficiency of nature protection actions. Thus the last defensibility to consider from positions of investment projects (IP) and, accordingly, apply to them available approaches and analytical methods. On the basis of fuzzy model for an establishment of an index of ecological sustainability of an environment the technique definition of relative weight coefficients of its basic factors and them priority for the balanced financing is offered.