Firstly,　cerium　dioxide(CeO2)　was　modified　by　3-(Methylacryloxyl)propyltrimethoxy　silane　(KH-570),　and　modified　CeO2　(mCeO(2))　was　prepared.　Then　poly　(urethane-acrylate)　was　modified　by　mCeO(2),　and　poly　(urethane-acrylate)/modified　CeO2　(PUA/mCeO(2))　composites　with　ultraviolet　absorption　property　were　prepared.　The　morphology,　thermal　hydrophobicity,　mechanical　properties,　optical　properties,　and　UV-absorption　properties　of　PUA/mCeO(2)　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/mCeO(2)　composites.　The　results　showed　that　with　the　increasing　of　the　mCeO(2)　content,　the　UV-absorption　property　of　PUA/mCeO(2)　composites　was　improved　gradually.　When　the　content　of　mCeO(2)　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/mCeO(2)　composites　was　improved　with　the　adding　of　mCeO(2).　With　the　increasing　of　mCeO(2)　content,　the　contact　angle　of　PUA/mCeO(2)　composites　increased　significantly.　And　the　UV-absorption　mechanism　of　PUA/mCeO(2)　Composites　was　studied.　UV-curable　PUA/mCeO(2)　composites　have　good　UV　absorption　property　and　water　resistance.　They　will　be　used　in　the　sun　screen　and　protect　people＇s　skin.