samples of mg_(0.5)zr_2(po_4)_3 compound with pure nasicon-phase were obtained by coprecipitation method with magnesium nitrate,zirconium acetate and diammonium hydrogen phosphate as raw material.the mg_(0.5)zr_2(po_4)_3(mzp)precursor powders were sintered via pressureless sintering and characterized by x-ray diffraction(xrd),scanning electron microscopy(sem)and electrochemical impedance spectroscopy(eis). the results show that samples sintered at 750 ℃ by the pressureless sintering showed the highest total conductivity of 4.67*10~(-6) s/cm and its density reached 90% of theoretical density.the activation energy of the samples is 0.098 ev.the studies have shown that mg_(0.5)zr_2(po_4)_3 is a promising magnesium ion conductive materials and of great significance for the research of solid-state magnesium ion battery in the future.