Repeated impact tests on a 1Cr18Ni9Ti sample and a 1Cr18Ni9Ti sample with Ni-2 laser cladding coating are done and grade test data were collected intermittently. The results show that under the repeated impact loading which is far below the yield strength of material, there will be plastic deformation on both 1Cr18Ni9Ti sample and 1Cr18Ni9Ti sample with Ni-2 laser cladding coating, and the deformation of the former is more than the latter. For the 1Cr18Ni9Ti sample: from the perspective of impact frequency, the deformation rate of the gridding in every layer is largest in initial thousands of times, with the increasing number of impact, deformation rate decrease gradually, until zero; View from the layer in coordinates, more closer to the surface gridding layer, the deformation rate is larger, The average deformation rate of the gridding decreases continuously with the increasing layers deep. For the 1Cr18Ni9Ti sample with Ni-2 laser cladding coating: coating surface deformation is largest, change of gradient reduces gradually along the layer deep, that means repeated impact deformation has ‘skin effect’, the value is inversely proportional to the depth from the surface. The matrix deformation is similar with the coating, the value is inversely proportional to the distance from the faying surface.