Abstract: Magnesium and calcium brick has good performance of coat adhesion performance when used on the cement kiln combustion zone，but when the kiln is stopped for maintenance or the temperature rises and falls suddenly，cracks and spalling are easy to occur between the MgO-CaO brick and the kiln crust，affecting its service life. MgO-CaO-ZrO2 bricks are prepared by taking MgO-CaO clinker and high purity magnesia as the main raw materials，adding calcium stabilized zirconia，pressing magnesium calcium zirconium bricks by hydraulic press under the pressure of 2 500 t through crushing，screening，batching, mixing and other processes，and firing them in tunnel kiln at 1 580 ℃ . Because calcium-stabilized zirconia is added to the ingredients，the normal temperature performance，hydration resistance and thermal shock stability of MgO-CaOZrO2 bricks are improved，and the stability of coat adhesion performance of MgO-CaO-ZrO2 bricks is also improved. The test shows that when the addition of calcium stabilized zirconia is 3%，its performance is the best.

Key words: Calcium-stabilized zirconia, MgO-CaO-ZrO2 brick, Cement kiln, Property