Abstract: In order to improve the design efficiency and the clients’ satisfaction of space simulators, the CAD/CAE software is used to carry out the 3D modeling and the simulation analysis of the cryogenic system of the space simulators successfully developed or being developed by BISEE. A specific digital integrated platform for designing the space simulator is designed successfully by the secondary development of the software Inventor. Based on the research of the parametric technology, the main nodes and the flow chart for the driving process design of the heat sink system are proposed, whose effectiveness is verified. Finally, the dynamic expansion of the library of the parts for the nitrogen system is discussed.