Double-disk vacuum pump is a rotating liquid as a piston, suction and compression gas rotary displacement pump, with the rotor and the pump without contact, isothermal compression and other characteristics, especially for suction and compression flammable, dust-containing, water Steam gas, in petrochemical, metallurgy, electric power, light industry, food and other industries have a wide range and irreplaceable applications. Dual-disc vacuum pump in use need to pay attention to different ways and principles, in accordance with the normal way to ensure the correctness of the design approach, to fully demonstrate the performance advantages. Now another new method of calculating rotor strength, it can accurately obtain the size and location of stress and deformation, so as to carry out accurate mechanical properties check. The calculation results show that the analytical method adopted in double disk vacuum pump can calculate and analyze the mechanical properties of double disk vacuum pump rotor well and provide a reliable theoretical basis for the optimal design of the product. Its performance is directly related to whether the pump can work normally. The rotor of dual disc vacuum pump (composed of impeller and pump shaft) is one of the key components of pump torque transmission. The traditional double disc vacuum pump calculation and checking method is complicated and the reliability is poor. Double-disk vacuum pump in the rotation need to follow certain technical parameters and methods of production and staff to ensure the safety performance in use, if the safety factor is less than the allowable safety factor, but also fatigue strength calculation. This process is computationally complex, large amount of calculations, repetitive, and poor reliability, it is likely because of calculation error, resulting in insufficient rotor strength caused by shaft cracking, shaft off accident. Therefore, it is imminent to study a new accurate and rapid method of strength analysis. In this paper, using ANSYS software to calculate the rotor displacement, stress and strain, in order to analyze and check the mechanical properties of liquid ring pump rotor. Can be used in different industries and fields, double-disc vacuum pump is a pump body with two turntables, can play an important performance and value in the use of the vacuum pump to ensure good development and progress, is widely used in petroleum, chemical, metallurgy , Mining, electricity, light industry and other infrastructure. The rotor (impeller and pump shaft) is one of the key parts of the pump to transmit torque, its failure will directly result in the entire unit to stop working. Therefore, the rotor strength calculation and check is an important part of the design of liquid ring pump. The traditional methods of design and analysis are generally to calculate the minimum diameter of the rotor by using the maximum torque transmitted by the rotor of the double disc vacuum pump and then calculating the load acting on the rotor and the torque, axial force and moment on different sections of the rotor , Using analytic method or graphical method to determine the position of the rotor in different positions of the reaction force, and finally using the traditional calculation of strength for verification, to determine the safety factor. More Keyword Search: Vacuum Pumps