Abstract:This paper deals with the project of ecoagriculture in the Huang-Huai-Hai Plain,which iit a comprehensive study on structures and functions of the agroecosystem as well as charaeteristics of the various subsystems,and energy conversion in the vanous subsystems,with a view to exploring interacuons among biome,soils and environment and their regulation,and to establishing various optimal artifical compound ecosystems.