Nano-zirconia is non-toxic and tasteless white powder, because of the sintering temperature and the addition of yttrium oxide stabilizer content can be divided into monoclinic phase, tetragonal phase and cubic phase three, soluble in sulfuric acid, hydrofluoric acid. Nano zirconia dispersion is good, has good thermochemical stability, high temperature conductivity and high strength and toughness, mechanical, thermal, electrical, optical properties are good, nano zirconia particle size is small, strong stability, with acid, alkali, corrosion resistance, high temperature resistance performance.