Abstract: Ceramic coatings can be metallurically bonded to metal sabstrate with plasma-melt-spraging, which has virtue of both plasma spray and harfacing. Coralt-based WC is hard, wear-reristant, corrosion-resistant and thermal-resistant. WC-17% Co coating was plasma-melt-sprayed on Q235 substrate. Influnce of proceis parameters (angle between plasma melting torch and spraying torch, distance between the plasma torch and the substrate, velocity of melting and spraying and feeding rate of powder) on appearamce of the coating was investigated, and the pavameters were optimized. Metallurgically bonded coating withoutdefects was obtained.