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In order to meet the requirements of digital design technology of agricultural equipments, a virtual experiments system platform on agricultural equipments by using MultiGen Creator, Vega Prime software and VC++ programming language was developed. The whole component of the virtual experiment system platform was introduced, together with its function, framework, and system process. Furthermore, the methods, processes and other key techniques related to the modeling process were discussed as well. The key techniques and difficult points of Vega Prime application were analyzed, such as dynamics simulation of custom model and realization of motion. The experimental results show stable operation of the system with the reliability and validity.