Based on the whirling characteristics of the rotor at critical speed,the whirling trajectory of the rotor was analyzed.Because the rotating track of the center of the rotating ring follows the rotor,the model of the liquid film region with eccentric rotating ring was established based on the circular moving track of the center of the moving ring.The finite difference method was used to discretize the generalized Reynolds equation,and the SOR iterative method was used to solve the discrete equation to obtain the pressure distribution on the end face of the liquid film seal.The influence of the eccentricity of the rotating ring on the performance parameters of the liquid film seal,such as the liquid film opening force,friction torque,leakage and cavitation rate,was discussed.The results show that with the increase of eccentricity,the groove area of the inner diameter grooved seal ring decreases,which leads to the decrease of dynamic pressure effect and the asymmetric distribution of seal face pressure.The opening force of liquid film and friction torque show a downward trend due to the decrease of seal ring surface pressure and uneven distribution.The leakage has a downward trend with the increase of eccentricity,while the cavitation rate increases first and then decreases with the increase of eccentricity.