At present time, Sintered NdFeB is one of the strongest magnet materials available. It contributes to the development of many small and flat motors used in the high-tech industry. Its high residual induction (Br), high intrinsic Coercive force (Hcj) and high Energy Product (BH), makes it suitable for servo motors, disk brushless motors, stepping motors, IT industry, MRI, and audio products. For NdFeB, its surface is usually treatd with some special methods. The surface treatment method include Zine, Nickel, Tin, Silver, Gold plating, Phosphor and Spray Epoxy Resin etc