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The heat transfer model of the mechanical seal ring is established, and the ratio of the frictional heat transferred by the moving ring and the static ring to the total heat is determined. With the aid of the finite element method, the coupling process of the friction heat of the liquid between the end faces and the thermal deformation of the end face of the seal ring is determined. The relationship between the rotating speed ω of the moving ring, the film thickness hi at the inner diameter of the sealing surface and the radial included angle β of the deformed end face of the sealing ring. According to the balance condition of the closing force and the bearing capacity of the liquid film, the corresponding ω corresponding to the given ω is obtained. hi and β.Analyze the relationship between the leakage rate and the closing force, and discuss the principle of using the closing force to control the leakage rate.