In order to reveal the influence of the oleic acid and linoleic acid,the main component of vegetable oil,to the lubrication,the adsorption and shear calculation of oleic acid and linoleic acid on Fe(110) surface were carried out by molecular dynamics simulation.The adsorption model of oleic acid,linoleic acid and Fe were constructed,and the model was geometrically optimized.The Fe(110) surface was selected as the adsorption surface,and the binding energy was defined.The adsorption calculation was carried out to obtain the combination energy for different ratios of oleic acid and linoleic acid.The fourlayer shear model was constructed,the COMPASS force field was loaded,and the Forcite-Confined shear module was used to perform the shear simulation to obtain the force in the three directions along the friction surface.Thereby,the friction factor was obtained by calculating.The calculation results show that the shearing ability of oleic acid is better than that of linoleic acid because of the larger adsorption capacity of oleic acid than that of linoleic acid.However,the adsorption energy and shear performance is not increased with the increase of oleic acid content.The adsorption energy is the highest and the shear performance is the best when the volume ratio of oleic acid to linoleic acid is 3∶1.