本文从保护菜农利益、保障城市供应的目的出发，依据系统动力学理论，构造了系统的微观结构模型，从而为系统模拟、政策分析提供支持．本文的意义在于探讨了社会经济问题的实验室研究法

In this paper,according to the system dynamics theory,the microcosmic structure is constitute about vegetable grower and ensuring supply to city with vegetable. This research can support system simulating and policies analyse. An important meaning of this paper is taking social-economic problems to laboratory.