Precision machining refers to a machining technology with a machining accuracy of 1～01μm and a surface roughness of Ra01～001μm. However, this precision limit will continue to change with the progress of processing technology. Today's precision machining may be tomorrow's general Processing. The problems to be solved by precision machining are machining accuracy, including form and position tolerance, dimensional accuracy and surface condition; and machining efficiency. Some machining can achieve better machining accuracy, but it is difficult to achieve high machining efficiency. Precision machining includes processing technologies such as micro-machining, ultra-fine processing, and finishing. Traditional precision machining methods include belt grinding, precision cutting, honing, precision grinding and polishing.