There is no distortion on the workpiece of which has used plasma spraying (temperature rise of the workpiece ≤200℃); the flame flow’s temperature of the plasma arc is high (≥10000℃), it is suitable for many kinds of materials, as oxide, carbides, borides ceramics, nickel base, iron base, cobalt base alloys, metal powders, etc., come into being wear-resisting coating, anti-corrosion coating, barrier coating, insulating blanket, etc.; the bond trength is high (50~70MPa), steady technics, the coating’s quality is great, by controlling atmosphere we can reduce oxidation inside the coating.