The lead-free 0.98(Na0.5,K0.5)NbO3-0.02Ba(Zr0.52,Ti0.48)O3-(hereafter NKN-BZT) CuO, ZnO-doped ceramics were prepared using a conventional mixed oxide method. NKN-BZT ceramics doped CuO, ZnO have superior structural and electrical properties than pure NKN-BZT ceramics. For the NKN-BZT-ZnO ceramics sintered at 1,120℃, piezoelectric constant (d33) of sample showed the optimum values of 172 pC/N. The 0.98(Na0.5,K0.5)NbO3-0.02Ba(Zr0.52,Ti0.48)O3-ZnO ceramics are a promising candidate for lead-free piezoelectric materials.