CNC machine tool at the beginning of the selection of aircraft parts with complex surface as a processing object, to solve the common processing method is difficult to solve the key. The biggest feature of NC machining is the automatic processing of the machine tool with perforated tape (or tape). As the aircraft, rocket and engine parts have different characteristics: aircraft and rockets 0, the size of large components, complex shape, engine 0, the component size is small, high precision. Therefore, the aircraft, the rocket manufacturing sector and the engine manufacturing sector of the selection of CNC machine tools are different. In the aircraft and rocket manufacturing, the use of continuous control of large-scale CNC milling machine, and in the engine manufacturing is not only the use of continuous control of CNC machine tools, but also the use of Point-control CNC machine tools (such as CNC drilling, CNC boring machine, machining centers, etc.).