ZrOCl2.8H2O and ZrO(NO3)2·2H2O were used respectively to synthesize a NASICON solid electrolyte by a sol-gel method.The structure and properties of two samples were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),and electrochemical impedance spectroscopy (EIS).The crystal structure was investigated by the Rietveld refinement.It is found that both the samples contain a monoclinic C2/c phase as the main conductive phase with the lattice parameters ofa=1.56312 nm,b=0.90784 nm and c=0.92203nm,though a small amount of rhombohedral phase is also detected in the final product.The sample synthesized by ZrO(NO3)2·2H2O conrains more monoclinic phase (89.48wt％) than that synthesized by ZrOCl2.8H2O (74.91wt％).As expected,the ionic conductivity of the latter is higher than that of the former; however,the activation energy of the latter (0.37 eV) is slightly higher than that of the former (0.35 eV).