The force field is an important factor to affect the reliability of the oilfilm bearing bush during the running process of oilfilm bearing.In order to improve the operating reliability of oilfilm bearing bush,the influence of assembly stress on the oilfilm bearing bush was studied.The assembly stress caused by the interference fit of bush and bearing seat,the friction force of oil film on bearing bush and the oil film pressure were calculated,and by loading the three kinds of forces on the bearing bush,the stress and strain of bearing bush was analyzed by finite element software.The simulated results were compared with that without considering the assembly stress and friction.The results show that the friction force of oil film on bearing bush is small and the effect of friction force on bearing bush can be ignored.The assembly stress of oilfilm bearing bushing in the initial condition changes the values and change rule of stress and strain in the bearing area of the bushing.The the effect of assembly stress on oilfilm bearing bushing should be considered to improve the operating reliability of oilfilm bearing bush when designing the oilfilm bearing bushing.