Bi2Te3-based materials are the most commonly used thermoelectric materials. It has been reported that their thermoelectric properties can be further enhanced by indium doping. However, there is no phase equilibria information of the Bi-In-Te system. Ternary Bi-In-Te alloys are prepared from pure elements. The primary solidification phases in the as-cast ternary alloys are determined. These experimental data are used together with the phase diagrams of its three binary constituent systems, Bi-In, Bi-Te and In-Te, to construct the Bi-In-Te liquidus projection. No ternary compound is found. There are ten primary solidification phase regions, including Bi, InBi, In5Bi3, InTe, In2Te3, In3Te5, In2Te5, Te, In4Te3 and Bi2Te3. The InTe and In2Te3 phases have the largest compositional regime as the primary solidification phases. There is a miscibility gap in the In-rich corner. The Bi-In-Te liquidus projection has eight invariant reactions. Their reaction temperatures and reaction types are determined by differential thermal analysis.