Abstract: Rare earth permanent magnetic materials have excellent properties and broad application prospects. The development and utilization of high abundance rare earth(La, Ce, Y, etc.) permanent magnetic materials is conducive to balance the utilization of rare earth resources and making up for the use of magnets with magnetic energy product of 36~200 kJ/m³ on the market. In view of the expectation of future intelligent manufacturing for higher performance permanent magnet materials, grain boundary diffusion technology is an important means to prepare high-performance magnets at present. How to further improve the diffusion depth of magnets and combine with existing processes is the primary problem to be solved in the development of grain boundary diffusion technology. The exploration of a new generation for permanent magnetic materials has never stopped, there is still a period of development to go through from theoretical research to practical production.