Taking the important ecological factors of ecological space as the breakthrough point, on the basis of properly dealing with the contradiction of "Sansheng" spatial land use, this paper explores the way of ecological space division in Xiangyin County, focusing on dividing the red line of ecological protection, water conservation and ecologically sensitive areas, determining the grade and value of factors according to the relative characteristics and scoring criteria of different factors, and constructing the current-based generation. The evaluation index system of ecological elements explores a reasonable way to delimit the ecological space of Xiangyin County, with a view to provide reference for the delimitation of ecological space of other counties in the future.