[en] By the methods of physicochemical analysis series of polythermal sections in CdBr₂ - PbBr₂ - CsBr ternary system is investigated. In double systems limiting ternary system formation of CsCdBr₃, CsPbBr₃, Cs₄PbBr₆ and CsPb₂Br₅ compounds is detected. Projection of the liquidus surface of the ternary system on triangle of compositions consisting of eight fields of primary phase crystallization: CdBr₂, PbBr₂, CsBr, CsCdBr₃, Cs₂CdBr₄, CsPbBr₆, CsPbBr₃ and CsPb₂Br₅ is plotted. Coordinates of nonvariant points are determined, isotherms are traced