[en] The phase equilibria of the La-Ti-Si ternary system at 773 K have been investigated mainly by means of X-ray powder diffraction (XRD) with the aid of scanning electron microscopy (SEM), optical microscopy (OM) and differential thermal analysis (DTA). The isothermal section consists of 14 single phase regions, 25 binary phase regions and 12 ternary phase regions. The binary compounds Ti₅Si₄ and La₂Si₃ are confirmed at 773 K. Therefore, there are 11 binary compounds in the system, which are La₅Si₃, La₃Si₂, La₅Si₄, LaSi, La₂Si₃, LaSi₂, Ti₃Si, Ti₅Si₃, Ti₅Si₄, TiSi and TiSi₂. No ternary compound is found in the work. None of the phases in this system reveals a remarkable homogeneity range at 773 K