During land use conversion from cropland to forest land, establishing the flexible resource between ecological system and economic system is important in order to form an integrated eco-economic system. Having considered the possibilities, the authors propose three characteristics of an integrated system, namely: defined purposes and effects of establishing an ecological system and an economic system, a steady eco-(economic) system structure and favorable feedback relationships and interrelated ecological, economic and social targets. The authors also discussed standards for constructing and integrated system and analyzed the suitability of these for Xiannan Valley Demonstrating Area.