Lead-free piezoelectric ceramics composition: (1-x) (K_0.465Na_0.465Li_0.07) NbO₃-xSrZrO₃ (x = 0, 0.005, 0.050, 0.095, 0.140 and 0.185) have been synthesized by the conventional solid-state method. The effect of SrZrO₃ content on their phase structure and dielectric properties was studied. Phase composition, microstructure and dielectric constant also were investigated. It was found that SrZrO₃ diffuses into the K_0.465Na_0.465Li_0.07NbO₃ lattice to form a solid solution during sintering. With increasing the SrZrO₃ content, the grain size becomes smaller. The dielectric properties of investigated ceramics were measured at room temperature and 1 kHz and 0.95 (K_0.465Na_0.465Li_0.07) NbO₃-0.05SrZrO₃ ceramic posses high dielectric constant.