Ce　and　La-Ce　containing　magnets　with　the　compositions　of　[(La0.4Ce0.6)(0.3)Nd-0(.7)](31.)5FebalM2.02B0.96　and　(Ce0.3Nd0.7)(31.)5FebalM2.02B0.96　were　prepared　by　a　grain　boundary　diffusion　(GBD)　process　with　TbHx　nanoparticles.　After　GBD　process,　the　coercivity　of　Ce　containing　magnet　with　CeFe2　phase　increases　by　only　7.2　kOe,　while　that　of　La-Ce　containing　magnet　without　CeFe2　phase　increases　by　8.8　kOe.　Comparing　the　two　of　magnets,　some　Tb　element　is　consumed　in　the　formation　of　the　(Tb,　Ce)Fe-2　phase,　therefore　reducing　the　enhancement　of　the　coercivity.　It　is　concluded　that　inhibiting　the　CeFe2　phase　can　promote　the　diffusion　effect　of　the　Tb　element　in　Ce　containing　magnets.　(C)　2019　Elsevier　B.V.　All　rights　reserved.