Abstract: CaTiO₃ ceramics were prepared at 1 300,1 400℃ for 3 h with CaO and TiO₂ as raw materials and being doped with 0, 1wt%, 2wt%, 3wt%, and 4wt% Y₂O₃. The effects of Y₂O₃ doping amount and sintering temperature on the phase composition, crystal structure, sintering properties and microstructure of the ceramics were investigated. The results show that the cell volume of CaTiO₃ first increased and then decreased with increasing Y₂O₃ doping amount. The substitution of Y³⁺ for Ti⁴⁺ increased the cell volume of CaTiO₃ while the substitution of Y³⁺ for Ca²⁺ reduced the cell volume. With the increase of Y₂O₃ doping amount or the rise of sintering temperature, both the sintering linear shrinkage rate and the bulk density of the ceramics increased. With the increase of Y₂O₃ doping amount, the microstructure of the ceramics became denser, the size of CaTiO₃ grains first increased and then decreased, and the grain shape changed from step-like morphology to regular polygons.