The titanium alloys with highly chemical activity require stable crucible refractories that can withstand the erosion of alloy melts. The phase composition and microstructure are crucial factors that affect the stability of the refractory crucible. The effect of Y2O3on the composition and microstructure of BaZrO3crucible was systematically investigated, and the improved mechanism of the stability of BaZrO3/Y2O3crucible was clarified in comparison with the BaZrO3crucible. The results showed that the erosion layer thickness of the BaZrO3/Y2O3crucible was only 63 μm, which was far less than that in the BaZrO3crucible (485 μm), and the erosion layer in the BaZrO3/Y2O3crucible also exhibited a higher density than that in the BaZrO3crucible. During the sintering, Y2O3could improve the densification of the BaZrO3crucible due to the solid solution effect between Y2O3and ZrO2, which also caused the evaporation of BaO, resulting in the generation of a Y2O3(ZrO2) film on the surface of the crucible. Furthermore, the Y2O3(ZrO2) had higher thermodynamic stability than Y2O3, confirming that the BaZrO3/Y2O3crucible with high density exhibited a superior erosion resistance to titanium alloys. This dual-phase structure provides a strategy to design a long-life and stable refractory for melting titanium alloys.