Two mathematical models of spiral groove liquid film seal with and without considering centrifugal inertia were established.Opening force,stiffness and leakage of liquid film seal under the two conditions were obtained by means of finite element method,and comparative analysis of the results calculated with and without considering centrifugal inertia was carried out.Results indicate that opening force,stiffness and leakage of liquid film seal are increased linearly with the increasing of rotating speed.With the increasing of film thickness,opening force and stiffness of liquid film seal are decreased,but leakage is increased gradually.The effects of centrifugal inertia on opening force and stiffness of liquid film seal can be neglected under different rotating speed and different film thickness.When the values of rotating speed and film thickness are large,the effect of centrifugal inertia on leakage of liquid film seal cannot be ignored.