Abstract: The rule of metal flow during cross wedge rolling was studied through FEM analysis in which some specific points were taken in the work piece and their positions were tracked.The squeezing amount of the small round part on the cam is smaller in the course of rolling,so the amounts of axial and radial metal flows in this area are smaller than those in other deformation zones.Uneven metal flow can influence the forming quality of the work piece.The small round part on the cam meshes with the cam groove on the tool,this kind of meshing function decreases the circumferential torsion applying on the small round part on the cam by the tool,and so the amount of circumferential metal flow in this area is smaller than that in other deformation zones.The centre metal offset of the cam part is bigger than that of other parts of the work piece because the cross-section of the cam is not circular and metal flow in this area is uneven.