Abstract:The rare earth La, Ce with high abundance and low cost are idle in large quantities, and using them to partially replace the rare earth Pr, Nd in sintered Nd-Fe-B is undoubtedly an economical and environmentally friendly technical route. In this paper, sintered Nd-Fe-B permanent magnets with high abundant rare earth La, Ce accounting for different proportions of total rare earth content (LaCe/Re) in magnets have been prepared by double main phase alloy method, and the magnetic properties and microstructure of the magnets have been studied. It is shown that the optimal sintering temperature slowly decreases with increasing LaCe / Re content in the magnet, more La, Ce enter the main phase of the magnet, and the distribution of La, Ce, Pr and Nd in the main phase of the magnet is relatively homogeneous, resulting in the absence of double main phase structure features or core-shell structure of the magnet; The increase of LaCe/Re ratio has a significant deterioration effect on the magnetic properties of magnets, and the remanence, squareness and maximum magnetic energy product of magnets show a gradually decreasing trend on the whole.