Equilibrium phase relationships for the pseudo-ternary systems Bi₂O₃-PbO-CaO and Bi₂O₃-PbO-SrO at 873K and 1073K in air have been studied mainly by the powder X-ray diffraction method. At 1073K, the regions of liquid or liquid plus solids were determined in the both systems. In these systems we found two new solid solutions ( α and β ) and two new compounds ( Bi₈Pb₇Ca₂O_x and Bi₈Pb₉Sr₃O_x ). Two new compositions Bi₃Ca₂O_x and Bi₁₁Pb₄O_x were proposed instead of Bi₁₀Ca₇O₂₂ and Bi₃PbO_x already reported, respectively.