A ternary defect compound CuGa3Te5 was synthesized by a spark plasma sintering technique and its structures and thermoelectric properties were evaluated at 318~717 K. The XRD analysis indicates that the compound is single phase CuGa3Te5 with a direct band gap (Eg) of ~1.0 eV. The maximum thermoelectric figure of merit ZT is 0.3 at 717 K.