Polyurethane　acrylate　(PUA)　dielectric　composites　were　prepared　by　UV　curing,in　which　alumina　(Al2O3)　and　barium　titanate　(BaTiO3)　were　used　as　fillers　to　construct　a　single　or　multi-component　system.　Hoping　to　provide　reliable　experimental　data　and　theoretical　references　for　3D　printed　dielectric　functionally　graded　materials,　the　microstructure　and　viscosity　of　compo-sites　with　different　fillers　were　analyzed.　Moreover,　the　influence　of　filler　types　and　the　filling　amount　on　the　dielectric　properties　of　composites　were　studied.　Fourier　transform　infrared　(FTIR)　spectroscopy　proved　that　the　UV-cured　composites　were　successfully　fabricated,　the　addition　of　fillers　did　not　change　the　chemical　structure　of　the　matrix　and　the　two　phases　about　filler　and　matrix　were　physically　combined.　Scanning　electron　microscopic　(SEM)　demonstrated　that　the　filler　particles　present　a　homogeneous　dispersity　in　the　matrix.　Furthermore,　the　addition　of　BaTiO3　increased　the　viscosity　of　the　system　to　a　greater　extent.　Through　testing,　in　a　one-component　system,　the　dielectric　loss　of　Al2O3/PUA　composites　with　the　filler　volume　fraction　of　50%　was　lowest　to　0.036　9　at　50　Hz,　which　was　40.9%　lower　than　that　of　pure　PUA.　As　the　filling　amount　of　BaTiO3　was　25%,　the　relative　permittivity　of　BaTiO3/PUA　composites　was　up　to　22.7,　which　was　241%　higher　than　that　of　pure　PUA.　In　the　two-component　system,　as　the　volume　fraction　of　Al2O3　and　BaTiO3　were　30%　and　10%　respectively,　the　relative　permittivity　of　the　composite　increased　to　13.0,　which　was　almost　doubled　compared　to　PUA,　and　the　dielectric　loss　was　reduced　by　18.8%　compared　to　the　composite　with　10%　BaTiO3,　indicating　that　the　co-introduction　of　BaTiO3　and　Al2O3　could　depress　the　dielectric　loss　while　increasing　the　relative　permittivity　of　the　composites.　©　2018,　Materials　Review　Magazine.　All　right　reserved.