Polycrystalline nonstoichometry titanium oxide, TiOx(x=1.6-1.9) ceramics with high density were prepared by a spark plasma sintering process at 1373 K using TiO2 and TiO as starting materials. The temperature dependences of the electrical conductivity, Seebeck coefficient, and power factor have been investigated. The results indicate that the electrical conductivity of all the samples is in the range of a semiconductor (51 S cm -1∼360 S cm-1), increases with temperature increasing, and decreases with oxygen content increasing. All samples show high negative Seebeck coefficients (-50∼-375 μVK-1), reveals that the primary carriers are electrons. Power factor of all samples increased with temperature increasing. The maximum power factor value of 5×10 -4 Wm-1K-2 has been obtained in TiO 1.6 ceramic at 873K, indicating the titanium oxide system could be a promising candidate for high-temperature thermoelectric application.