Taking the NJ2205 cylindrical roller bearing for compressor as the analysis object,aiming at the problem of “edge effect” and “eccentric load effect” in the stress distribution between roller and raceway under eccentric load condition,the roller was modified by Romax software.The influence of different eccentric load coefficients on the distribution characteristics of contact stress under radial load was analyzed,and the optimal eccentric load coefficient and the corresponding bearing range were determined.The results show that the contact stress is asymmetrically distributed along the contact line under eccentric load,the maximum contact stress shifts to the heavy load end,and the effective bearing length of the roller decreases,resulting in the contact stress in the heavy load area of the roller is much higher than that at the light load end.The increase of contact stress between roller and raceway with the increase of radial load under eccentric load is obviously greater than that under normal load.With the increase of the eccentric load coefficient,the eccentric load effect is significantly improved and the stress distribution tends to be uniform,but the increase of the eccentric load coefficient will lead to the concentration of the stress peak to the middle of the roller.There is an optimal eccentric load coefficient under certain working conditions,which makes the roller obtain the optimal bearing capacity,reduces the contact stress and significantly improves the fatigue life.