A phase diagram of the alloys of the ternary system of Ag-Sb-Sn was constructed on the basis of the data obtained by X-ray analysis and metal-lographic examinations.The phase diagram obtained consists of six single-phase regions (namely a,β,γ,β′, Sn and Sb regions), seven two-phase regions(namely a+β,β+γ,γ+β′,γ+Sn,γ+Sb,β′+Sn,β′+Sb regions) and two three-phase regions(namely γ+β′+Sn,γ+β′+Sb regions). No new phase was observed in these alloys of the ternary system.