Non-toxic　rare　earth　(RE)　composite　materials　are　promising　and　active　in　optoelectronic　fields,　such　as　pigment.　In　this　work,　Na　ions　doped　y-Ce2S3　pigments　were　synthesized　by　solid-phase　vulcanization　and　followed　by　in-situ　synthesis　to　prepare　an　outer　layer　of　CePO4　film.　The　characterizations　of　X-ray　diffraction　(XRD),　scanning　electron　microscopy　(SEM),　transmission　electron　microscopy　(TEM),　X-ray　photoelectron　spectroscopy　(XPS),　solid　state　nuclear　magnetic　resonance　(NMR)　indicate　that　Na-doped　y-Ce2S3　and　CePO4　uniformly　and　tightly　coated　core-shell　structure　was　successfully　synthesized.　The　thermogravimetric　analysis　(TG)　and　reflection　spectrum　(RS)　reveal　that　the　CePO4　coating　significantly　improves　the　colorant　and　thermal　stability　performance　of　y-Ce2S3　.　The　excellent　color　quality　of　y-Ce2S3　@CePO4　(L*　=　45.16,　a*　=　55.94,　6*　=　44.53)　is　achieved　and　the　red　color　(L*　=　43.82,　a*　=　49.79,　6*　=　38.04)　is　still　retained　even　if　the　sample　is　heated　in　air　at　400　degrees　C　for　30　min.　(C)　2021　Published　by　Elsevier　B.V.　on　behalf　of　Chinese　Society　of　Rare　Earths.