In a certain pressure difference and seal the surface of the mechanical surface morphology, the tight seal of the W-shaped seal ring sealing effect and tight seal with the flange area close to a reasonable choice of seal ring structure parameters can be enhanced by its flange seal Strict area to achieve the purpose of improving seal integrity. By finite element analysis software ABAQUS is used to simulate the influence of main structural parameters and pre-tightening amount on the sealing area of W-ring and flange, the following results were obtained: The larger external radius, pre-compression and wall thickness Parts and flange sealing area increases, the wall thickness and the outer radius of the seal ring in the flange contact area greater influence in the design process should be considered seal effect and stiffness flexibility, a reasonable choice of wall thickness and outer radius size.