In recent years, additive manufacturing (3D printing) has rapidly warmed up globally and has become one of the industry's focuses. This technology has been widely used in aerospace, automotive, medical, metal, and mold and other industrial fields, and it has become more intelligent in manufacturing. The core processing elements of the transformation. The additive manufacturing technology acquires a 3D printing model of an object, so that a product having a complicated design can be easily created with higher accuracy by means of conceptualization with the help of additive manufacturing. Different technologies can be used for additive manufacturing, such as direct writing, fused deposition modeling, stereolithography, electron beam melting, selective thermal sintering (SHS), selective laser sintering (SLS), selective laser melting (SLM) ), direct metal laser sintering, layered solid manufacturing and powder bed method. It is predicted that between 2016 and 2026, the compound annual growth rate of the market will reach 18-22%. Additive manufacturing technology is expected to provide more areas for component and finished product design. Selective laser melting (SLM) is a major change in the manufacturing process. Compared to traditional machining cutting and milling, SLM is a material accumulation manufacturing method that can produce a variety of complex shapes and give full play to the material's performance ratio. It is the future. One of the main ways of green manufacturing. In addition, as one of the direct additive manufacturing technologies for metal parts, SLM technology has high forming accuracy, good performance, and no need of tools and molds. It is a typical digital process and is currently irreplaceable in the formation of sophisticated metal parts. In addition to its flexible design, short production cycle, low cost, and personalized small-volume production, the advantages of metal 3D printing in the future will also bring about two major changes: First, it will have a transformative impact on component materials technology: the realization of high-performance new materials. Digital manufacturing; the second is the transformational impact on equipment manufacturing technology: the realization of digital manufacturing of super large complex structures. The national key research and development program “additive manufacturing and laser manufacturing†has a special implementation period of five years (2016-2020). The main work is to break through the basic theories of additive manufacturing and laser manufacturing, obtain original technological achievements, and deploy advanced research and development. A generation of technologies; Overcoming the core components and key process technologies for additive manufacturing; Developing key process equipment; Breaking key technologies in laser manufacturing; Developing high-reliability long-life laser core functional components, domestic advanced lasers, and developing high-end laser manufacturing process equipment .