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Al-Li alloys are considered. A quantitative approach to the determination of the ratio of the frac tions of the binary and ternary intermetallic phases in Al-Mg(Cu)-Li alloys is developed on the basis of chemical and phase composition balance equations and the experimentally measured lattice parameter of the α solid solution. The ratio of the fractions of the δ'(Al 3 Li) and S 1 (T 1 ) phases in Al-Mg(Cu)-Li alloys is shown to be determined by the ratio of the mole fractions of Li and Mg(Cu). Equations are proposed for cal culating the weight fractions of the S 1 (Al 2 MgLi), T 1 (Al 2 CuLi) and δ'(Al 3 Li) phases in domestic and foreign