With the restriction of tradition manufacturing process, there are some problems on long production cycle, high production cost, difficulty in reducing weight and so on. It is vital to develop the manufacturing method of aerospace product efficiently and quick. Comparing with the tradition manufacturing process, additive manufacturing technology is a new direction in manufacturing technique field by distinct manufacturing idea. The main contents include the description and the superiority of additive manufacturing technology, and the in-depth research, the achievement apply on metal additive manufacturing (laser/electron beam/electric arc).