Laser cladding of FeCrSiB alloy coatings on A3 steel plate has been performed with a 5kW CcO2 laser. The microstrueture and performance have been significantly improved. Laser cladding casing consist of a’-Fe+y-Fe+M23O6+M7C3+Fe2B. Excellent performances of surface alloy have been, obtained on low priced steel plate. It is shown that laser cladding ia via-ble for controllably modified aiaterialS aurface.