This paper summarises some new development of the double glow plasma surface metallurgy technology in the last few years： Ti - Cu and Ti - Cr burn-resistant alloys have been produced on the surfaces of titanium and titanium alloy Ti6A14V. Co - W - Mo - Fe age-hardened high speed steel and high Cr alloy have been formed on the surface of carbon steels. Ti - Cu wear-resistant alloy was also produced on the surface of pure copper. By using this process and solid graphite as carbon source, hydrogen-free carburising has been achieved in order to avoid hydrogen embrittlement of titanium. The experimental results indicate that the double glow plasma surface metallurgy is an advanced and powerful method for surface alloying.