章以北京大兴县留民营村为例，建立了中型（村庄级）农业生态工程的数学模型，该模型为分室模型，由8个分室组成，文中给出了各个分室的状态变量及控制变量，建立了各分室的数学模型，并应用该数学模型指导了留民营的实际生产建设，取得了良好结果。

Mathematic model of agricultural eco-engineering is to represent the knowledge of system*s present situation, function and structure. Based on study and analysis, a mathematic model of medium-sized agro-ecological engineering—Liuminying ecological agro-systemisis established. This system consists of eight branch rooms. The state variables and the control variables for each branch room are given and the mathematical models for the branch rooms are also built. The mathematical model has been applied to guiding the pratical production in Luiminying Villnge and satisfactory results are achieved.