Abstract: CaZrO₃ containing the highest CaO colltellt of compounds in system CaO-ZrO₂ is a potential refractory material. A satisfactory CaZrO₃ raw material as formed from equimolar proportions of CaCO₃ and ZrO₂ subjected to two-stage synthesis:preparing first at 1450℃ and then refiring to 1 600℃. A close approach to theoretical density specimen was obtained with finely ground the raw material at 1700℃ sintering. By SEM the grains of CaZrO₃ with perfect morphology was found to be linking closely in it.