In　this　study,　UV　curable　polymer　composites　are　investigated　to　explore　their　applicability　in　building　the　dielectrics　with　functionally　graded　material　(d-FGM)　using　stereolithographic　3D　printing　technology.　On　the　prepared　test　samples,　several　dielectric　properties,　i.e.,　permittivity,　dielectric　loss　and　breakdown　strength,　are　characterized.　3D　printing　feasibility　of　the　polymer　composites　are　also　investigated　by　measuring　the　viscosity　and　curing　depth.　Finally,　influences　of　the　ceramic　filler＇s　type,　volume　fraction　and　particle　morphology　on　the　dielectric　properties　and　3D　printing　feasibility　are　discussed.