Rapid prototyping technology, also known as Rapid Prototyping Manufacturing (RPM) technology, was born in the late 1980s. It is a new manufacturing technology based on the material accumulation method. It is considered to be a significant achievement in the manufacturing field in recent 20 years. It is a set of mechanical engineering, CAD, reverse engineering technology, layered manufacturing technology, numerical control technology, material science, laser technology, can automatically and directly, quickly and accurately transform the design prototype for a certain function or production parts directly, making, so as to prototype new design ideas to the check etc. provides a means to achieve a high efficiency and low cost. That is, rapid prototyping is to use the data of three dimensional CAD to accumulate layers of materials into solid prototypes through a rapid prototyping machine.