45# carbon sterl with a buckytube coating was modified by laser cladding and a consequent heat treatment. Rockwell hardness and the structure of the sample surface were examined with SEM and TEM. The results indicate that the surface properties of 45# carbon steel with buckytube coating are improved remarkably after medification. The average macro-hardness of the surface with optimal parameters is HRC65. At the same time, the corresion-resistance is also improved obviously.A new structure corrosion-resistant carbide as well as a great deal of polygonal crystallites which were of the order of 10 -1 micron and dispersed in a martensite matrix were observed.