Abstract: In order to find out the forming rules for axial parts with super large area reduction during twice cross wedge roiling, the extreme roiling experiment under different process conditions was done on an H630 rolling mill. The effect rules of process parameters on the roiling quality were achieved. It is shown that process parameters have determinant effect on the internal defect and tension fracture of the parts with super large area reduction. If the parameters are proper, the qualified axial parts with large area reduction can be produced.