The 0.96(K0.48Na0.52)(Nb1-xSbx)O3-0.04(Na0.82K0.18)0.5Bi0.5ZrO3(KNNS-BNKZ) lead-free piezoelectric ceramics were prepared by the direct synthesis and twostep synthesis method. The effects of different addition ways of the (Bi, Na, K)ZrO3 (BNKZ) and the amount of Sb on the microstructure and electrical properties of KNNS-BNKZ ceramics were studied. The results showed that the phase structure of KNNSBNKZ ceramics prepared by direct synthesis method were tetragonal phase at room temperature, while the ceramics prepared by twostep synthesis were orthorhombictetragonal coexistence.The density,the dielectric constant εr,the piezoelectric coefficient d33 of samples prepared by twostep synthesis method increased with the increase of Sb content, while the Curie temperature (TC) decreased. And the optimized electrical properties can be obtainedwhen the Sb content was 0.06, with εr of 1 659, tan δ of 0.038, TC of 243 ℃, and d33 of 138 pC/N.