A mathematical model of spiral groove liquid film seal was established based on the massconserving JFO cavitation boundary condition.The Reynolds equation considering centrifugal term of liquid film was solved by the streamline upwind finite element method,and pressure distribution was obtained.Then the effects of operating parameters on cavitation characteristics were analyzed.The results indicate that the rupture position of liquid film is located on the boundary of spiral groove.The increase of rotating speed,the decrease of film thickness and medium pressure all promote the generation of cavitation.On the contrary,the occurrence of cavitation will be inhibited.The calculation results provide theoretical guidance for the design and application of liquid film seal under different operating conditions.