Study of ultra-precision cutting mechanism has a lot of progress in recent years. For example, when the ultra-precision machining of brittle materials, processing surface may not produce brittle fracture traces and get a mirror, which involves the conversion problem to brittle-ductile brittle material cutting thin plastic resection, which recently made a lot of new insights. From the experimental results of ultra-precision cutting of glass is visible, at the beginning of the cutting thickness is very small, the removal mechanism is the removal of the plastic processing brittle surface without signs of breakage. With the increase of the thickness of the cut, cut gradually transformed into the plastic brittle fracture removal, surface machining can be seen clearly fragile signs of breakage.