At present there are a lot of waste of energy in the mechanical processing, which causes increasingly serious pollution of environment. Resource conservation and environmental protection are achieved through the application of green manufacturing technology in mechanical processing. Remanufacturing project, which is a green project according with national sustainable development, is a method to resolve the waste of resources. Laser remanufacturing is a new concept of advanced repair technology that integrates advanced processing technology of laser cladding, laser cladding materials technology and many other technologies. Laser remanufacturing technology is based on laser cladding which is a new surface modification technology. This article describes the technical characteristics and principles of laser cladding. And this paper introduces laser remanufacturing technology by the examples of rotors, gears, shafts and other large wearing parts. the laser remanufacturing technology with the fast development, high efficiency and precision, will not only have a broad market demand, but also have significant economic and social benefits.