Lead-free 0.79(Bi0.5Na0.5)TiO3-0.14[Bi-0.5(K-0.5 Li-x(x))]TiO3-0.07BaTiO(3) (BNBK79 + xLi, x = 0.0, 0.1, 0.2, 0.25, 0.3, and 0.4) ceramics were prepared by conventional solid state reaction process. The crystalline structures and surface morphologies are investigated by X-ray diffraction method and scanning electron microscopy. Dielectric and piezoelectric properties were measured. With increasing of lithium substitution, the Curie temperatures of BNBK79 + xLi ceramics increase, but the maximum value of the dielectric constant decreases. And a relatively large remnant polarization of 17.6 mu C/cm(2) and 157 pC/N of d(33) has been obtained when x = 0.3. (C) 2009 Elsevier B.V. All rights reserved.