The abrasive is a sharp, hard material that is used to grind the softer surface of the material. The abrasive has two kinds of natural abrasive and man-made abrasive. According to the hardness of the classification of Superhard abrasive and ordinary abrasive two categories. The range of abrasive is very wide, from the softer household detergent, gem abrasive to the most hard material diamond. Abrasive is an essential material for the manufacture of every kind of precision product. Many natural abrasives have been replaced by man-made abrasives. Besides diamond, the properties of natural abrasive are not very stable, but they still have their use value. Diamond is the highest hardness of abrasive, the origin of South Africa, accounting for the world's total output of 95%, the rest is Brazil, Australia, Guyana and Venezuela and other places. Industrial diamond from Gray white to black range, after milling can be made of grinding wheel, abrasive belt, polishing wheel and grinding and so on.