With　the　tendency　towards　higher　power,　higher　capacity　and　less　scale　of　the　pulsed-power　devices,　the　vacuum　surface　flashover　strength　turns　to　be　a　primary　limitation　of　the　development　of　the　pulsed-power　equipments,　as　it　is　much　lower　than　the　vacuum　breakdown　strength.　To　improve　the　different　capabilities　of　the　epoxy　composite　material,　different　kinds　of　micron　inorganics　are　filled　to　the　epoxy　resin.　TiO2　(TO)　is　a　typical　kind　of　oxide　ceramic,　as　well　as　an　important　sort　of　broad　band-gap　oxide　semiconductor　material.　With　its　unique　optical　and　electrical　properties,　excellent　chemical　stability,　high　dielectric　constant　and　semi-conductive　properties,　it　is　widely　applied　to　enhance　the　performance　of　the　organic　composite　material.　In　this　article,　the　experimental　results　of　vaccum　surface　flashover　characteristics　of　epoxy　resin　and　epoxy　resin　cast　with　1　mu　m　powdered　TO　samples　are　presented.　In　addition,　their　dielectric　spectrum　and　thermally　stimulated　depolarization　current　(TSDC)　are　measured.　Considering　the　influence　of　the　dielectric　constant,　the　conductivity,　the　trap　energy　and　the　trap　density,　associated　with　the　interface　theory,　the　article　analyzes　the　influence　mechanism　of　micro-scale　TO　fillers　oil　the　vacuum　flashover　voltage　of　epoxy　composite　material.