In order to further explore the effects of cavitation on the sealing performances,the spiral groove liquid film seals were taken as an object,and the mathematical model was established based on the JFO cavitation model and coordinate transformation and was solved by discretizing the governing equation with the finite control volume method.Both the distributions of velocity field and flow field under the different cavitation boundaries of Reynolds and JFO were discussed,and the effects of cavitation pressure on the sealing performances such as loadcarrying capacity and friction torque were analyzed.Results indicate that the formation of cavitation area is dynamic and the velocity vector in cavitation area is zero.At the liquid film rupture boundary and reformation boundary near the inner diameter,the velocity vector faces the cavitation area,but it is far away the cavitation area at the liquid film reformation boundary near the outer diameter.The liquid film flow field is mainly concentrated in the groove and the distribution of flow field under the JFO cavitation boundary is denser than that under the Reynolds cavitation boundary.The increase of cavitation pressure is helpful to improve the loadcarrying capacity but the increase is smaller,while the effect of it on the friction torque is negligible.