Rare earth elements from the family is a 15 lanthanides, coupled with lanthanides and yttrium scandium closely related to total 17 kinds of elements. They are: lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, yttrium. Neodymium is the largest user of NdFeB permanent magnet materials. The advent of NdFeB permanent magnets, rare earth high-tech fields injected new vigor and vitality. NdFeB magnet high energy product, known as the contemporary "King of the permanent magnet of" its excellent performance is widely used in electronics, machinery and other industries.