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Lead-free piezoelectric ceramics with the composition of (Nao0.53K0.435Li0.035)Nb0.94-xSbxTa0.06O3(NKLNST)are synthesized by a conventional solid-state sintering process.An MPB-like region between orthorhombic and pseudocubic phases is found in this system.The density,piezoelectric and dielectric properties are enhanced greatly in this region.A composition (Na0.53K0.435Li0.035)(Nb0.86Sb0.08Tao.06)O3 is found to have excellent electrical properties:d33=320pC/N,kp=49%and kt=43%,as well as relatively low loss,tan δ=4.2%,and high relative density higher than 96%.which indicare that this ceramics is a promising lead-free piezoceramicsreplacing for lead zirconate titanate.