High-temperature　multilayer　ceramic　capacitors　(HT-MLCCs)　are　indispensable　key　basic　components　in　high-temperature　electronic　equipment.　Obtaining　practical　HT-MLCCs　requires　not　only　a　high-temperature　dielectric　with　excellent　temperature　stability,　but　also　a　good　match　between　the　inner　electrode　and　the　dielectric.　In　this　work,　a　quaternary　lead-free　system　(1-x)　(0.64Na(0.5)Bi(0.5)TiO(3)-0.16　K0.5Bi0.5TiO3-0.20Bi　(Mg2/3Nb1/3)O-3)-xCaZrO(3)　(NBT-KBT-BMN-xCZ)　was　investigated　as　candidates　for　high-temperature　dielectric.　The　introduction　of　CZ　can　adjust　the　composition　of　different　types　of　polar　nanoregions　(PNRs)　and　weaken　the　ferroelectric　coupling　behavior,　thereby　achieving　the　flattening　of　the　dielectric　temperature　curve.　Among　all　the　components,　NBT-KBT-BMN-0.06CZ　(0.06CZ)　has　the　most　excellent　high-temperature　dielectric　properties,　and　is　further　used　to　match　the　two　inner　electrodes　of　Pt　and　Ag/Pd　to　make　HT-MLCCs.　The　results　show　that　for　Pt-MLCC,　co-firing　causes　a　second　phase　MgTi2O5　to　appear　at　the　heterogeneous　interface,　resulting　in　incomplete　inner　electrodes,　lower　dielectric　permittivity　and　increased　loss　in　the　high-temperature　region.　In　contrast,　for　Ag/Pd-MLCC,　the　heterogeneous　interface　is　well　bonded,　the　inner　electrode　is　continuous　and　complete　and　there　is　no　second　phase,　which　makes　the　capacitor　show　excellent　dielectric　performance　(epsilon(r)　=　1393　+/-　15%,　tan　delta　＜=　0.025)　over　a　wide　range　of　129-404　degrees　C.　This　work　provides　an　important　solution　for　the　development　of　a　new　generation　of　HT-MLCCs.　(C)　2022　Elsevier　B.V.　All　rights　reserved.