Abstract: With the application of the principles of eco-economics, the structure, function and features of eco-economic system in Zichang county arc comprehensively analyzed The results showed that the ecological environment quality was quite low, the ecological balance was maladjusted, economical structure was improper and the economic benefit was low in the county. The fragility of ecosystem and the irrationality of economical structure result in vicious cycle of eco-economics. The vicious cycle is still going oa The countcrmcasurcs for realizing the synchronous improvement and the harmonious development of the ecological and economical systems arc also proposed.