In ultra-precision machining, the main factors to ensure the quality of the surface in addition to high-precision machine tools, ultra-stable processing environment, high-quality tools is also an important aspect. Natural diamond with high hardness, good wear resistance, high strength, good thermal conductivity, low coefficient of friction with non-ferrous metals, good adhesion and excellent corrosion resistance and chemical stability, can grind extremely sharp blade, is considered Is the ideal ultra-precision cutting tool material, in the field of machining especially ultra-precision machining has an important position and has been widely used.