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Composite ceramics based on Ba_0.6Sr_0.4TiO₃ and BaZn₆Ti₆O₁₉ are prepared by conventional solid-state reaction method. The sintering temperatures of the composites can be decreased by 100–200°C compared with pure Ba_0.6Sr_0.4TiO₃. The microstructures and dielectric tunable properties of the composites have been investigated. The dielectric constant is tailored from 7200 of pure Ba_0.6Sr_0.4TiO₃ to 2400 of 10wt% doped BaZn₆Ti₆O₁₉ and 400 of 60wt% content of BaZn₆Ti₆O₁₉; the tunability measured at 30kVcm⁻¹ is 41.4% for 10wt% doped BaZn₆Ti₆O₁₉ and 22.5% for 60wt% content of BaZn₆Ti₆O₁₉, both of which are sintered at 1200°C. The Q value of 60wt% content of BaZn₆Ti₆O₁₉ is 154. The high tunability and high Q value of the samples indicate that the Ba_0.6Sr_0.4TiO₃–BaZn₆Ti₆O₁₉ composite ceramics are potential applicable materials for microwave tunable devices.