A phase diagram of the alloys of the ternary system of silver-tin-aluminium wasconstructed on the basis of the data obtained by X-ray analysis. The phase diagram obtained consists of six single-phase regions (namely a, μ, β, γ,Sn, and δ regions), eight two-phase regions (namely α+μ,α+β,β+μ,β+γ,γ+Sn,β+Sn,β+δ and Sn+δ regions), and three three-phase regions (namely α+β+μ,β+γ+Sn and β+Sn+δ regions). No new phase was observed in these alloys of the ternary system.