BN is an excellent material of high-temperature resistance, corrosion resistance, thermal conducting, insulating and lubrication. It is widely used in petroleum, chemicals machinery,electronics, electric power, textile, nuclear industry, space technology and many other industry fields.As a multi-functional material,it is also applied to the insulator, solid doping material of semi-conductor,structual material of nuclear reactior, packing material of neutral radiant resistance, lubricant of high temperature resistance, drawing pattern agent of moulds, and grease of anti-oxidization. In addition, the powder of boron nitride can be used as the anti-adhesive agent of glass beads, the drawing pattern agent of glass and metal moulds. The last but not the least, the superhard material made of boron nitride can also be applied as the high speed cutting tools, the drill heads for geographic exploration and petroleum exploitation.