The alteration of oil film bearing capacity of hydrostatic sliding bearing under the combined effect of the suspended particles in lubricant and the cavitation phenomenon was studied based on the twophase fluid dynamics.The pressure distribution of the oil film under those conditions was obtained.The effect of particles concentration and gas dissolution rate on oil film bearing capacity of low speed and heavy load sliding bearing was analyzed under oil supply by single oil hole or double oil hole.The calculating results show that the oil film bearing capacity can be improved by increasing the solid particle concentration in lubricant or increasing the solid particle diameter under a certain solid particle concentration,but the effect of solid particles on the stability of flow should be taken into consideration at the same time when studying the effect of solid particles on hydrostatic bearing.Under fixed cavitation saturation pressure,the pressure field of oil film has only a little change with the change of gas volume rate.