Firstly,　cerium　dioxide(CeO2)　was　modified　by　3-(Methylacryloxyl)propyltrimethoxy　silane　(KH-570),　and　modified　CeO2　(mCeO2)　was　prepared.　Then　poly　(urethane-acrylate)　was　modified　by　mCeO2,　and　poly　(urethane-acrylate)/modified　CeO2　(PUA/mCeO2)　composites　with　ultraviolet　absorption　property　were　prepared.　The　morphology,　thermal　hydrophobicity,　mechanical　properties,　optical　properties,　and　UV-absorption　properties　of　PUA/mCeO2　composites　were　studied.　XRD　and　SEM　analysis　showed　that　the　modified　CeO2　had　better　dispersion　in　the　matrix　than　that　of　pure　CeO2.　Ultraviolet–visible　spectrum　and　thermogravimetric　analysis　were　used　to　characterize　the　optical　properties　and　thermal　stability　of　PUA/mCeO2　composites.　The　results　showed　that　with　the　increasing　of　the　mCeO2　content,　the　UV-absorption　property　of　PUA/mCeO2　composites　was　improved　gradually.　When　the　content　of　mCeO2　is　3%,　the　absorption　of　ultraviolet　of　PUA/mCeO2　composites　is　about　5　times　of　pure　PUA　film,　and　the　absorption　band　is　mainly　in　the　UVA　section.　The　thermal　stability　of　PUA/mCeO2　composites　was　improved　with　the　adding　of　mCeO2.　With　the　increasing　of　mCeO2　content,　the　contact　angle　of　PUA/mCeO2　composites　increased　significantly.　And　the　UV-absorption　mechanism　of　PUA/mCeO2　Composites　was　studied.　UV-curable　PUA/mCeO2　composites　have　good　UV　absorption　property　and　water　resistance.　They　will　be　used　in　the　sun　screen　and　protect　people＇s　skin.　©　2021　Wiley　Periodicals　LLC.