In order to improve the reliability of the lubricating oil system and avoid bearing wear,CFD was used for the analysis of the lubrication characteristics of taper-flat sector thrust bearing of screw pump.The axial force of the screw pump was calculated to obtain the range of the oil film bearing capacity.The finite difference method was used to obtain the oil film pressure and thickness distributions.The finite volume method was used to simulate the bearing pressure field with different oil film thicknesses and inlet temperatures.The results indicate that the temperature has an impact on bearing pressure by affecting viscosity.When the oil film thickness is fixed,the lower the oil inlet temperature,the greater the viscosity,and the greater the pressure load on the bearing.When the oil inlet temperature is the same,the thickness of the oil film decreases,and the load-bearing capacity increases.Therefore,when the lubricating oil pump is started at low temperature,the bearing pressure may exceed the allowable value and bearing wear is caused during the process of the oil film to balance the axial force of the screw from thin to thick.