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