A black crystal powder, is one of the hardness Man-Made materials, its hardness with Mohs hardness 9.36 and micronscopic hardness 5400-6300Kg/mm2 is only near upon diamond, its density is 2.52g/cm3, and melting point at 2450, the boron carbide possesses properties of endurance high/low temperature, no reaction with either acids or alkalis, high grinding efficiency, no magnetism. It is a good replacement of diamond. Boron carbide possesses the specialty properties of light quality, neutron absorbing, semi-conductivity, etc. so it is used for armed forces and nuclear industry. Boron carbide is widely applied as follows: boriding refractory, ion transfuse, film layer as well as grinding, polishing, drilling hard metal alloys, jewels etc. Meanwhile, it is main material for wear-resisting parts, precise meter-age element, precise spray nozzle, sealed washed, smelting boron steel, boron alloy, etc. Boron carbide has showed many better properties of physics and chemistry in the hi-science/technology field.