Neodymium-Iron-Boron (NdFeB) magnet is mainly made of Nd2Fe14B by powder metallurgical method, it has good machin-ablility property, its shape has disk, ring, blcok, segmen and heteromorphism. Now develop new produce can work well at temperature up to 250℃. Since Neodymium magnet (NdFeB) ' poor corrosion resistance, normal it is plated, such as Zn, Ni,double Ni, NiCuNi, Epoxy, AU,etc. Neodymium (NdFeB) magnet has highest cost performance.