The chromium oxide materials were prepared using Cr2O3 micropowder as main starting material, TiO2 micropowder as sintering aid, polyvinyl alcohol as binder, by a series of processes such as slurrying, spraying granulation, machine moulding and cold isostatic pressing, and firing at 1 500 ℃ for 3 h in air (oxygen partial pressure was 2.1×104 Pa), industrial nitrogen (oxygen partial pressure was 1×103 Pa), pure nitrogen (oxygen partial pressure was 10 Pa), high purity nitrogen (oxygen partial pressure was 0.1 Pa), and carbon cake embedded atmosphere (oxygen partial pressure was 2.3×10–12 Pa). Effects of oxygen partial pressures on the sintering behavior of Cr2O3 materials were investigated. The results show that (1) for 3 wt% TiO2 doped specimens, there is a substantial dependence of sintering on oxygen partial pressure (0.1 Pa–2.1×104 Pa), and the bulk density increases and apparent porosity decreases with oxygen partial pressure decreasing; (2) even if the oxygen partial pressure is 0.1 Pa, the specimen without TiO2 cannot reach densification sintering; (3) under very low oxygen partial pressure of carbon embedded atmosphere, Cr2O3 materials containing TiO2 or not can attain densification.