To overcome the stress concentration phenomenon of the roller of the track needle roller bearing,a non-ideal Hertzian contact model between the roller and the raceway was presented by using the non-ideal Hertzian contact theory.The effects of the fully crowned profile,partially crowned profile with one curvature center,partially crowned profile with two curvature centers,and logarithmic profile on the stress distribution between roller and raceway were studied.The results show that the contact deformation of partially crowned profile with two curvature centers is smallest in the same radial load;there is the stress concentration phenomenon in the partially crowned profile with one curvature center case and partially crowned profile with two curvature centers case;the stress distributions of fully crowned profile and logarithmic profile case are even,the stress distribution of logarithmic profile case is smaller.Logarithmic profile is the most suitable modification method for the roller of the track needle roller bearing among the four methods.