In order to precisely analyze the stress of internal combustion engine bearing under the condition of high journal rotation speed and specify the effect of journal rotation speed on the stress of bearing,one-way fluid structure interaction was used to build the finite element model of bearing based on the computational fluid dynamics model of sliding bearing oil film.The change of pressure,load,and components of oil film with journal rotation speed was obtained,and the bearing stress and strain under the condition of different journal rotation speed were also calculated.The results show that the oil film pressure,bearing load,bearing stress and strain are all increased with the increasing of journal rotation speed.The maximum bearing stress and strain are increased nearly linearly with the increasing of journal rotation speed.This is because the maximum oil film pressure is augmented linearly as journal rotation speed increases.As for the oil film component,with the rotation speed increasing,the volume fraction of lubricating oil is decreased at the entrance,and in the oil film breakup area the gradient of volume fraction of oil film is more apparent.