Improvements　in　phase　stability　and　dielectric　characteristics　can　broaden　the　applications　of　zirconia　in　ceramics.　Herein,　a　series　of　Y2O3-stabilized　zirconia　(YSZ)　ceramics　are　synthesized　using　solid-state　sintering,　followed　by　an　investigation　into　their　phase　evolution,　grain　size,　dielectric　constant,　and　breaking　field.　As　the　Y2O3　content　increases　from　0　wt%　to　4　wt%,　the　as-grown　YSZ　ceramics　undergo　a　distinct　phase　transformation,　transitioning　from　monoclinic　to　monoclinic　+　tetragonal　and　further　to　monoclinic　+　tetragonal　+　cubic,　before　finally　returning　to　monoclinic　+　cubic.　Significant　changes　occur　in　the　internal　microstructure　and　grain　size　of　the　ceramics　as　the　phase　composition　alters,　resulting　in　a　reduction　in　grain　size　from　3.17　mu　m　to　0.27　mu　m.　Moreover,　their　dielectric　constants　exhibit　an　increasing　trend　as　the　Y2O3　content　increases,　rising　from　3.92　to　13.2.　Importantly,　the　dielectric　breakdown　field　of　these　YSZ　ceramics　shows　a　similar　variation　to　the　phase　evolution,　ranging　from　0.11　to　0.15　MV/cm.　This　study　sheds　light　on　the　phase　evolution　and　dielectric　properties　of　YSZ　ceramics,　offering　an　efficient　strategy　for　enhancing　their　dielectric　performances.