In　this　work,　we　proposed　a　method　to　enhance　the　magnetic　properties　of　(Nd,　Ce)–Fe–B　magnets　with　Ce/TRE　ratios　below　25　wt%　by　introducing　a　moderate　amount　of　La　elements.　The　segregation　behavior　of　La　elements　towards　grain　boundaries　(GBs)　was　utilized　to　optimize　the　GB　phase　structure.　Incorporation　of　La　atoms　into　the　main　phase　induces　lattice　expansion,　leading　to　an　increased　formation　of　Ce3+　ions　with　enhanced　magnetic　moments.　Comparative　analysis　with　the　original　magnet　(La/Ce　=　0　wt%)　demonstrates　that　the　magnet　with　a　La/Ce　ratio　of　10　wt%　exhibits　improvements　of　0.3%　in　remanence,　12.6%　in　coercivity,　and　0.6%　in　maximum　energy　product.　These　results　underscore　that　the　moderate　addition　of　La　elements　enhances　the　fluidity　of　the　rare　earth-rich　phase　and　optimizes　the　distribution　of　lamellar　GB,　consequently　reinforcing　the　magnetic　isolation　effect.　Furthermore,　the　promotion　of　the　transformation　from　Ce4+　to　Ce3+　ions　contributes　to　the　comprehensive　enhancement　of　the　magnetic　properties.　This　research　offers　a　novel　strategy　for　fabricating　high-performance　and　resource-efficient　sintered　magnets　based　on　LaCe　alloys.　©　2024　Chinese　Society　of　Rare　Earths