The development of Urban Leisure Agriculture mainly depends on the ecological and economic system theory of the Urban Leisure Agriculture.Using theory of agricultural ecological-economics and adopting the method of theoretical analysis,this paper analyzes the connotation and features of ecological-economic system theory of the Urban Leisure Agriculture and various ecological and economic factors influencing ecological-economic system theory of the Urban Leisure Agriculture.This paper also tries to establish the ecological and economic system theory of the Urban Leisure Agriculture with three- encircled structures and explicitly explains the functions and methods of the three circles including foundation circle,appreciation circle and the support-controlling circle.