Each kilogram of spacecraft can reduce launch costs 20,000 US dollars, lightweight design weight loss for each gram is significant. The traditional structure design is limited by the processing ability of the traditional processing technology and can only be designed by experience and accumulation. There are often problems such as uneven force distribution and uneven material distribution. Based on the metal 3D printing technology and the optimized structure of topological optimization design, On the basis of satisfying the function and rigidity, the strength is enhanced, the local stress is reduced, the weight loss is very obvious, the load is more uniform, and the material is evenly and rationally distributed. The 3D printing technology can process any complicated structure, the manufacturing cost is independent of the structure Complexity, breaking the shackles of the traditional processing technology, for structural optimization design provides a more flexible degree of freedom, especially for topology optimization design of complex geometric processing components.