With the rapid development of computer technology, 3D printing (additive manufacturing/rapid prototyping) technology is based on the principle of layered manufacturing and accumulates materials layer by layer to directly manufacture digital models into solid parts. It has be applied in many fields. 3D printing technology and traditional processing have their own advantages. Mixed manufacturing of 3D printing and traditional processing is becoming one of the methods for prototyping and manufacturing of new products. In the field of civil aircraft manufacturing, parts produced by 3D printing, especially the metal ones, require further postprocessing (e.g. heat treatment) before they can be put into production. For 3D printed parts of specific metal materials, the shape can be optimized and controlled, and the static properties of the structure can be comparable to that of castings and forgings. However, due to the limitation of the nondestructive testing ability, the internal porosity and microcracks of 3D printed parts are unpredictable. The understanding of 3D parts is still far from traditional processing in civil aircraft application.