La　substitution　for　Ce　inhibits　the　growth　of　the　CeFe2　phase　and　promotes　the　formation　of　the　single　2:14:1　phase,　leading　to　an　improvement　in　the　magnetic　properties　of　melt-spun　(La/Ce)(3)Fe14B　ribbons.　Among　which,　the　(La0.3Ce0.7)(3)Fe14B　ribbon　produced　a　high　remanence　of　6.86　kG,　a　coercivity　of　5.51　kOe,　and　a　maximum　energy　product　(BH)(max)　of　7.68　MGOe.　After　spark　plasma　sintering,　the　compacted　(La(0.3)Ce(0.)7)(3)Fe14B　magnet　with　good　remanence　and　coercivity　was　successfully　prepared,　and　these　properties　were　enhanced　to　5.14　kG　and　5.60　kOe,　respectively,　leading　to　an　energy　product　of　4.59　MGOe　for　the　magnet　with　5　wt　%　NdCu　addition.