The WC granule is in-situ synthesized during the reaction of the alloy powders employing the TIG powder surfacing.The microstructure and morphology of the tungsten carbide coating is observed and analyzed.The elements of both the coating and the substrate diffuse to each other.The excellent metallurgy bonding is formed between the coating and the substrate.The results of the thesis show that we can get good performance of high-temperature coating by heating with TIG,which provides a theoretical foundation for the industrial practical application of WC composite coating.