① A large number of tooling is reduced, and complex tooling is not needed for parts with complex shapes. To change the shape and size of parts, only the part processing procedure needs to be modified, which is suitable for the development and modification of new products.

② The machining quality is stable, the processing precision is high, the repetition precision is high, which is suitable for the machining requirements of the aircraft.

③ The production efficiency is high under the condition of multi variety and small batch production, which can reduce the time of production preparation, machine tool adjustment and process inspection, and reduce the cutting time due to the use of the best cutting quantity.

④ The complex profile which can be processed by conventional methods is difficult to process, and even some parts which cannot be observed can be processed.

The disadvantage of NC machining is that the machine tool equipment is expensive, and it requires the maintenance personnel to have a high level.