In order to study the effect of the change of surface topography of seal faces and the shear thinning characteristics of the lubricating fluid significantly on the steady state characteristics of the spiral groove liquid film seal,based on the powerlaw model,a mathematical model for the steady-state characteristics of the spiral groove liquid film seal considering the shear thinning characteristics of the lubricating fluid,the radial taper and the circumferential waviness of the sealing end face was established.The steadystate Reynolds equation was solved by the finite difference method.The influence of radial taper and circumferential waviness on the steady-state characteristics of shear thinning fluid spiral groove liquid film seal was analyzed.The results indicate that when the taper is increased,the liquid film seal opening force is reduced,the leakage amount is increased,and the friction torque is decreased.The shear thinning characteristics of lubricating fluid can significantly reduce the opening force and leakage of the seal face,and slightly increase the friction torque.When the wave number is increased,the liquid film sealing opening force is increased,the leakage amount is slightly decreased,and the friction torque is increased.When the amplitude is increased,the liquid film sealing opening force is increased,the leakage amount is increased slightly,and the friction torque is significantly reduced.The effect of waviness on the steadystate characteristics of the shear thinning fluid liquid film seal is slightly weaker than that on Newtonian fluid,but the overall trend remains the same