The evaporative crystallization system itself is a system that needs to operate in a continuous vacuum state, and the whole system maintains vacuum in a dynamic process. Therefore, the stability of the vacuum system is required to be very high. The vacuum system is one of the core devices to ensure the results of evaporative crystallization. According to the characteristics of materials, the matching degree between the performance of the vacuum pump itself and the device requirements should be considered, as well as the matching degree Economy and security. With many years of experience in design and use, tuochi has a good ability in design, manufacturing, assembly, commissioning, application and maintenance of vacuum system.