The rubber seal is composed of a rubber ring and a plastic seal ring.The deformation of the plastic ring during installation has an important effect on the sealing performance.VL type combined seal for shaft was taken as an example,based on three-dimensional finite element simulation model and visual seal assembly platform,the assembly process of different processes was studied.The sealing ring assembly process was restored in the finite element simulation,the visual sealing assembly platform was built,and the sealing assembly test was carried out to verify the accuracy of the finite element simulation assembly process.The key parameters such as contact pressure and contact width of sealing interface were extracted to evaluate sealing performance.The relationship between sealing performance and assembly process was established,the sealing installation and correction process was optimized to solve the randomization and experience of assembly process.The test results indicate that the contact width of the sealing surface is smaller than that of the heating installation at room temperature.In terms of the shaft,under identical medium pressure conditions,a narrower contact width corresponds to higher contact pressure on the sealing surface and superior sealing performance.Therefore,it can be concluded that assembling at room temperature yields improved sealing performance.