<p>Ca_1−<i>x</i>(KBi)_0.5<i>x</i>Bi₂Nb₂O₉ (<i>x</i> = 0.00, 0.02, 0.04, 0.06, 0.08, 0.10, CBN-<i>x</i>KB) piezoelectric ceramics were synthesized by the traditional solid-phase sintering method. The influences of K⁺/Bi³⁺ co-doped CBN ceramics on the microstructure, electrical properties and high temperature resistivity were discussed. The results showed that the CBN ceramics with the appropriate amount of K⁺/Bi³⁺ co-doping were a single orthorhombic phase. The changes in intensities of the Raman peaks indicated that K⁺/Bi³⁺ co-doping decreased the concentrations of oxygen vacancies and reduced the lattice distortion, which improved the electrical properties of CBN ceramics with effect. When <i>x</i> = 0.06, the Ca_0.94(KBi)_0.03Bi₂Nb₂O₉ ceramics obtained optimal properties with the piezoelectric coefficient <i>d</i>₃₃ of 10.6 pC/N (twice as much as that of pure CBN), the high Curie temperature <i>T</i>_c of 924 °C, the remnant polarization <i>P</i>_r of 3.65 μC/cm² and the dielectric loss tan<i>δ</i> of 1.79% at 600 °C. And the resistivity at elevated temperatures was also improved. After the annealing treatment, all component samples maintained more stable piezoelectric properties at 800 °C. It can be seen that K⁺/Bi³⁺ co-doped CBN ceramics would offer significant potential for applications in high temperature sensors and other fields.</p>