Aimed at the sealing problem of automotive exhaust pipe,a V-shaped metallic sealing ring for automotive exhaust system was designed.The sealing ring adopts the mode of plane contact and small contact pressure,which can meet the sealing requirements and avoid large preload.The circular arc transition is adopted at the trough to reduce the overall stiffness of the seal ring,and the side angle is tilted to increase the resilience of the seal ring.ANSYS Workbench software was used to analyze the sealing performance of the V-shaped metallic sealing ring under normal temperature pretightening and high temperature conditions,the appropriate axial compression for installation was determined under the requirement of sealing strength.The influence of sealing ring structural parameters on sealing performance was analyzed.It is found that wall thickness,ring width,trough radius,contact circle radius and opening angle have a significant impact on sealing performance.Multi-objective optimization of the sealing ring structure was carried out based on Design-Expert software,and the maximum equivalent stress of the sealing ring was reduced,the contact pressure was increased,and the mass of the sealing ring was reduced.The reliability of the finite element model was verified by relevant experiments.