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Boron carbide, a black crystal powder, is one of the hardest Man-Made materials, its hardness with Mohs hardness 9.36 and microscopic hardness 5400-6300kg/mm2 is only near upon diamond, its density 2.52g/cm3 and melting point at 2450 , The boron carbide possesses properties of endurance hi/low temperature, no reaction with either acids or alkalis, high grinding efficiency, no magnetism. It is a good replacement of diamond. Boron carbide also possesses the specialty properties of light quality, neutron absorbing, semi-conductivity, etc. so it is used in 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 materials for the wear-resisting parts, precise meter-age element, precise spray nozzle, sealed washer, smelting boron steel, boron alloy, etc. Boron carbide has showed many better properties of physics and chemistry in the hi-science/technology field.