Based on Hertz elastic contact theory,the contact deformation formula between logarithmic modified tapered roller and raceway was derived.Based on elastohydrodynamic lubrication theory,the equivalent stiffness analysis model of roller raceway contact pair of logarithmic modified tapered roller bearing was established.The contact deformation distribution of roller and raceway was obtained by the finite element static contact analysis of logarithmic modified tapered roller bearing with an example.The results show that the contact deformation is decreased with the increase of effective roller length and equivalent curvature radius.The equivalent contact stiffness is increased with the increase of contact load,increased linearly with the increase of effective contact length of roller,and decreased with the increase of modification.