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　μm　to　0.27　μm.　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.　©　2024　by　the　authors.