Abstract: With zirconium oxychloride,nitrate of lime and amonium as the raw materials,nanometer-sized powder of （ZrO₂ ）_0.9-（CaO）_0.1  was prepared by chemical coprecipitation method under the doping of nitrate of lime and 600　℃ to calcine.The grain was tested by the TEM and BET analysis,and phase structure was analysed through XRD and Raman spectrum.All the results indicated that the powder's particle size is 8.9 nm and cubic crystal particle is 0.5　nm.

Key words: （ZrO₂ ）_0.9-（CaO）_0.1, nano-powder, cubic phase