Barium　titanate　based　dielectric　ceramics　have　been　widely　used　in　science　and　technology,　industry　and　daily　life　because　of　their　good　dielectric　and　positive　temperature　coefficient　characteristics.　Under　the　demands　of　emerging　fields,　it　is　of　great　significance　to　develop　dielectric　ceramic　materials　with　low　Curie　temperature　and　high　room　temperature　resistivity　characteristics.　Therefore,　a　ceramic　material　doped　with　different　concentrations　of　yttrium　oxide　(Y2O3)　with　positive　temperature　coefficient　(PTC),　barium　strontium　titanate　(Ba0.7Sr0.3TiO3,　BST),　was　prepared　by　the　conventional　solid-state　reaction.　The　physical　and　chemical　properties　of　the　samples　are　observed　by　X-ray　diffraction　and　scanning　electron　microscope.　The　broadband　dielectric　spectrometer　and　resistivity-temperature　measurement　system　are　used　to　obtain　the　dielectric-temperature　properties　and　resistivity-temperature　characteristics　of　the　samples,　and　a　four-quadrant　model　is　constructed　to　analyze　the　influence　mechanism　of　yttrium　(Y)　on　the　dielectric-temperature　properties　and　resistivity-temperature　characteristics　of　the　material.　The　results　show　that　the　relative　permittivity　and　Curie　temperature　increase　first　and　then　decrease　with　the　increase　of　Y2O3　content,　while　the　resistivity　at　room　temperature　shows　an　opposite　trend.　The　relative　permittivity　(＞105)　can　be　significantly　increased　by　doping　0.0008　mol　Y2O3,　and　has　a　lower　Curie　temperature　(34.1　℃)　and　a　higher　resistivity　at　room　temperature　(5.6×106　Ω·cm).　The　synergistic　regulation　of　low　Curie　temperature　and　high　resistivity　characteristics　is　realized,　which　broadens　the　application　range　of　PTC　materials.　©　2023　Science　Press.　All　rights　reserved.