Abstract: The occurrence probability and existence form of internal defects in rolled pieces during threeroll and two-roll cross wedge rolling were compared and analyzed by finite element numerical simulation.The reason that the internal defects little occur at the center points and fissure takes an annular form during three-roll rolling was expounded based on the state of stress and strain at the center of rolled pieces. It is indicated that three-roll cross wedge rolling process has a distinct advantage in the forming quality of the center of rolled pieces.