Abstract: There are many factors that are not conducive to densification during the sintering of Al₂O₃-MgO-CaO refractory, affecting its certain properties to be utilized. Therefore, Al₂O₃-MgO-CaO composite was prepared at 1 500~1 600 ℃ with the addition of CeO₂ micro powder to investigate the effect of CeO₂ on the densification of the composite. Experimental results show that the best sintering temperature is 1 600 ℃. When 4 % and 6 % of CeO₂(mass fraction, the same below) are added, the apparent porosity reduce to 3.9 % and 3.8 %, respectively. Meanwhile, the bulk density increases to 3.62 g/cm³ and 3.68 g/cm³, respectively. Moreover, it is found through scanning electron microscope that the densification degree of this series of refractories' microstructure is higher after CeO₂ is added.