The article presents the results of a theoretical study of the determination of the traction resistance of the plow body when the formation is undercut. The influence of the undercut width of the formation on the energy performance of the plow and the traction resistance of the hull is studied, taking into account the width of the undercut of the formation. According to the results of the research, it was found that the traction resistance of the body depends on the width and thickness of the processed layer, the width of its undercut, the angles of the plowshare to the bottom and the wall of the furrow, the thickness of its blade, the speed of the unit and the physical and mechanical properties of the soil.