The effect of Mn doping on sintering and densification behavior of commercial CeO 2 powder has been investigated in this study. The results from both X-ray diffraction (XRD) and thermal gravimetric-differential thermal analysis methods indicate no binary compounds are formed between CeO 2 and MnO 2 , and Mn element exists in the state of Mn 2 + (i.e. MnO) in the samples sintered above 1200 o C. Dilatometer measurement and scanning electron microscopy observation confirm that small amount of Mn doping reduces sintering temperature dramatically and promotes grain boundary mobility. About 1% Mn-doped CeO 2 sintered at 1300 o C for 2 h reaches almost full densification (>99.0% of relative density), compared with ~96% of relative density for pure CeO 2 sintered at 1525 o C for 2 h, and both samples have almost the same grain size.