Under the condition of small liquid droplets distributed in the gas phase uniformly,the gasliquid mixed physical model was set up,the equivalence viscosity expressions was deduced,and the gasliquid mixed lubrication Reynolds equation was built.A finite element program was compiled to solve the gasliquid mixed lubrication Reynolds equation to obtain pressure distribution and sealing performance parameters of gasliquid mixed fluid between the seal faces.The influence of liquidgas ratio on the sealing performance was analyzed under the same operating conditions.The analysis results show that the hydrodynamic effect is enhanced because of the liquid droplets at the same film thickness.The seal face clearance,friction power consumption and mass leakage are increased and volume leakage is decreased with the increasing of liquidgas ratio under the operation conditions of constant speed,pressure and closing force.The fluid stiffness is firstly increased and then decreased with the increasing of liquidgas ratio,there exists a maximum value for fluid stiffness.