CVD diamond uses methane and hydrogen as the precursor, under high temperature (about 1000℃), atmospheric pressure (1 atmospheric pressure) or low pressure conditions, with natural diamond, HPHT diamond or CVD diamond substrate as the substrate, CVD diamond can be divided into CVD single crystal diamond and CVD polycrystalline diamond, CVD diamond can be grown by gas phase epitaxial method. Widely used in ultra-precision tools, semiconductors, optical materials, missiles, aerospace, lasers, electronic devices and other fields.