The isothermal section at 770 K of the phase diagram of the Ti-Cu-Sb ternary system has been constructed. One earlier known (Ti 5 CuSb 3 antimonide with Hf 5 CuSn 3 structure type) and six unknown ternary compounds were found. The crystal structure for four new compounds have been determined: Ti 2 CuSb 3 -Zr 2 CuSb 3 structure type (space group P4m2, a=0.39238(2) nm, c=0.86445(5) nm); Ti 2 Cu 3 . 1 4 Sb 2 . 8 6 -HfCuSi 2 structure type (space group P4/nmm, a=0.39527(3) nm, c=0.97854(5) nm); Ti 5 Cu 0 . 4 5 Sb 2 . 5 5 -W 5 Si 3 structure type (space group I4/mcm, a=1.04741(4) nm, c=0.52374(2) nm); TiCu 2 Sb-MnCu 2 Al structure type (space group Fm3m, a=0.5929(1) nm).