In order to solve the problems of the traditional design process of synchronous valves, such as the long development cycle, the low design efficiency, the high input cost, and the low precision, the synchronous valve digital design system is designed. The system integrates a variety of CAD/CAE/CFD software. Through the application of key technologies such as synchronous valve parametric design process, three-dimensional parametric automatic modeling, three-dimensional model automatic assembly, as well as the optimization design of the overall structural parameters of the synchronous valve, the digital processes such as design, optimization and simulation of the synchronous valve are realized. Through the key technology design, the system is verified in different types of synchronous valves design feasibility. The verification results show that the system not only greatly improves the efficiency of synchronous valve design, but also provides theoretical experience for digital design of other products.