Abstract: In order to improve the properties of resistances to thermal shock and bending of inert anode of NiFe2O4 spinel, such additives as MnO2, TiO2 and V2O5 in trace amount were added to its raw materials and then they were all sintered together at 1200°C for 6 hr, i.e., preparing a doped inert anode by the process of powder metallurgy. The effects of different kinds and amounts of additives on sintering and microstructure of the inert anode were studied, as well as the effect of microstructure and density on its properties, such as the resistances to thermal shock and bending. The results showed that the three additives can benefit the sintering process to different degrees and improve the density. The additive MnO2 can make grains finer with grain size distributing more uniformly. But TiO2 or V2O5 will make the grains coarser with non-uniform grain size distribution. It means that only MnO2 can improve the resistances to thermal shock and bending.