Abstract: The author researched the sustainable development ability of Poyang Lake ecological economy zone, and ordering, as the region better realize the harmony of zoology and economy, in order to implement the national strategy to provide decision-making. The author constructed the ecological support, economic support, social support three system based on Poyang Lake ecological economic zone, sustainable development evaluation index system, and to the Poyang Lake ecological economic zone in25 major county as research in specific areas, using AHP and principal component analysis to measure. The results showed that: sustainable development ecological support capacity of the top county, the comprehensive sustainable development capacity ranking general front; at the expense of ecological support to economic development, social support of prefectural region comprehensive sustainable development ability was generally not high.