Abstract: In this research, graphic technology was applied to crop simulation for visualizing the simulation results. The users can directly compare the practical situation with the visualized simulation results, and make appropriate cultivation decision. Based on Object-Oriented Programming(OOP) and the characteristics of crop simulation system, the Document-View architecture in Micosoft Foundation Classes(MFC) was extended as Model-Document-View(MDV) architecture, which separates the models, data management and user interfaces. The architecture makes the communication between classes more efficient, and the simulation system can be integrated into several MDV groups with the architecture. The architecture, as an extension of the OOP, simplifies the structure of simulation system and systematic management. The observed values and simulated values of "Zhongjian-100" in 2000 by Visual Rice Growth Model(VRGM) were also compared in this paper.