ZrO2 nanoparticle is white powder of high purity. It appears oblique crystal at low temperature and shows tetragonal crystal formation at high temperature. Nano ZrO2 is soluble in sulfuric acid, hydrofluoric acid and has good thermal-chemical stability. When at high temperature, it has electrical conductivity and good strength and toughness. Nano ZrO2 also possesses good mechanical, thermal, electrical and optical properties.