In order to select the various factors reasonably to control liquid film cavitation effectively,taking the spiral groove mechanical seal as the research object,the governing equation was solved based on the mass conservation JFO boundary condition by the streamline upwind finite element method.The influence of working condition parameters on liquid film cavitation characteristics was analyzed.The results indicate that with the decreasing of medium viscosity,balance radius and spring force,the pressure on windward side decreases,the pressure on leeward side increases,the liquid film cavitation rate is decreased,and the changing trend of critical speed of cavitation is opposite to critical pressure.With the decreasing of medium viscosity and spring force,the changing trends of cavitation rate with rotating speed and inner pressure are both decreased.With the decreasing of balance radius,the increasing trend of cavitation rate with rotating speed decreases and the changing trend of cavitation rate with inner pressure increases.