Failure of the high temperature tools includes mainly hot-wearing, oxidizing and hot-fatigue. According to this character, Ni-based high temperature alloy + WC and MCrAlY alloy (M=Ni, Co) + WC are coated on the steel substrate by laser cladding. The observation of microstructure and mechanical perfomance of the claddings have been carried out. The results show that the coatings of Ni-based high temperature alloy + WC have a higher hot strength-hardness than that of MCrAlY alloy + WC, but the latter has better oxidation resistance than that of Ni-based igh temperature alloy +WC. The above two classes of coatings are applied to the seamless tube plugs, as a result, the service life of the plugs has been improved by 1~4 times. Among the coatings, the MCrAlY alloy +10% WC is the best.