Aimed at the problems of extremely low viscosity of lubricating oil,difficult formation of lubricating oil film and easy wear on the surface of the radial sliding bearing of aircraft fuel pump,by comprehensively considering the factors such as turbulence,thermal effect,mass conservation,temperature viscosity effect and mixed lubrication boundary,the thermohydrodynamic lubrication analysis model of the bearing was established.The finite element method was used to solve the Reynolds equation,energy equation and contact equation to obtain the static characteristics of the bearing.The effects of bearing clearance ratio,width diameter ratio,rotating speed,load and oil inlet temperature on the static lubrication performances of bearing,such as oil film thickness and oil film pressure,were studied.The results show that due to the low dynamic viscosity of aviation kerosene,the floating speed of the bearing is more than 5 500 r/min,the ultimate bearing capacity is less than 37 N,and the oil film thickness is too low.Reducing the oil inlet temperature,properly reducing the clearance and increasing the bearing bush width are conducive to increasing the oil film thickness and improving the bearing reliability.This research has certain engineering reference value for the design,operation and maintenance of radial sliding bearing of aircraft fuel pump.