Abstract: Compared with the natural ecosystems, agroecosystems possess their own special characteristics. Based on this point, some relationships in the eco-agricaltare establishment were discussed. For example:the relationship between "self-sustained" and "high input/output" System, between diversity of Structure and roles of dominent components, between small-scale management and large-scale development, and between ecological improvement and economic development. in addition the author put forward his own point of view on these problems.