While Studying the growth of the cucumber plant, the paper uses "Dual-Scale Automation Model" to drive the generation of the topological structures. "Dual-Scale Automation Model" is a plant growth model based on plant growth mechanisms, the parameters of which have explicitly physical meaning. The model is easy to understand and implement in programming. Based on the growth of the cucumber plant and introduce mechanism of reiteration and delay law of plant growth, the simulation process is more accord the botanical law.