This　work　investigates　the　effects　of　semiconducting　TiO2　nanowires　on　electrical　properties　of　epoxy.　TiO2　nanowires　with　diameters　around　50　nm　and　length　between　1　and　3　micrometer　were　prepared　by　a　hydrothermal　process,　and　then　uniformly　dispersed　into　epoxy　matrix　through　a　solution　route　by　sonication.　After　cured　by　temperature　programed　heating,　the　electrical　properties　of　the　samples,　including　dc　volume　resistivity,　dielectric　permittivity　dependence　on　frequencies,　and　Thermally　Stimulated　Discharge　Current　(TSDC)　were　measured.　These　properties　are　compared　to　those　measured　from　SiO2　nanoparticle-epoxy　and　TiO2　nanoparticle-epoxy　composites　prepared　using　the　same　method.　Results　of　this　study　show　some　interesting　dielectric　characteristics　and　confirm　the　fact　that　the　adding　of　TiO2　nanowires　has　a　large　influence　on　their　dielectric　properties.