In this paper, it has been studied that the hardened zones of ductile iron QT800-2 are processed through laser shock again, after laser quenched. The results indicate that properties of the zone treated through compound method is improved, compared to that through only laser quenched. The hardness increases by 18% and the wearability enhances about 100%. Especially, the residual stress of the interior of the material was changed into compressive stress.