In this study the construction of the yield component systemis regarded as the grey dynamic procedure in which all the yield elements are related to each other. Based on the data generation and model-building theory of the grey system, the yield component grey system model is constructed using the data from separate seeding date tests atequal intervals in a year. The impact of different seeding dates on the yield component system is simulated by Runge-Kutta method .The results are satisfactory.