Abstract: Li_1.1Y_0.1Zr_1.9(PO₄)₃powder was prepared by the sol-gel method.The effects of sintering methods on the performance of Li_1.1Y_0.1Zr_1.9(PO₄)₃ electrolyte were investigated. The thermal properties of the precursors were analyzed by differential scanning calorimetry. The phase, the structure as well as the electrochemical properties of the solid electrolyte were characterized by X-ray diffraction, scanning electron microscopy and electrochemical impedance spectroscopy. The results show that the pure phase of NASICON type Li_1.1Y_0.1Zr_1.9(PO₄)₃ is successfully prepared by the sol-gel method. Compared with the conventional pressureless sintering, SPS sintering can obviously increase the density of the sample(94.38 % of the theoretical density), and the ionic conductivity reaches as high as 8.99 × 10^-5 S/cm at room temperature.