(1 -x)(K0.498Na0.498Li0.04)NbO3-x(Bi0.5Na0.5)(0.9)Ba-0.1(Zr0.0055Ti0.9945)O-3 (KNLN-BNBZT100x, x = 0, 0.01, 0.02, 0.03, 0.05, 0.1) lead-free ceramics were prepared by conventional solid-state reaction technique. The influences of the BNBZT on the crystal structure, dielectric, and piezoelectric properties of the ceramics were investigated. The ceramics formed single-phase solid solutions with perovskite structure after sintering in air at 1050-1100 A degrees C for 3-4 h. Morphotropic phase boundary (MPB) between orthorhombic and tetragonal phase was found in the composition range of 0.01 a parts per thousand currency sign x a parts per thousand currency sign 0.02. The Curie temperature, T (c), and the orthorhombic-tetragonal transition temperature, T (O-T), shifted to low temperature as BNBZT increased. The dielectric and piezoelectric properties of ceramics were enhanced for the composition near the MPB. The maximum value, 194 pC/N, of piezoelectric constant d (33) together with the mechanical quality factor Q (m), 20, were obtained when BNBZT content was 2 mol%.