Abstract: In order to improve the surface performance of A3 steel,we utilize a high power CO2 laser beam to treat TiC-B4C-SiC-Co clad surface. It is obvious that the laser beam scanning speed is a important factor on the structure,hardness and resistance to abrasion of the alloy surface. This paper introduces the experimental research procedure,and the experimental results,which are useful to select the beam scanning and other technical parameters.