Abstract: To understand the complicate corrosion mechanism of NiFe2O4 based cermets inert anode in aluminum electrolysis, the chemical corrosion of the cermets was studied. The preparation process of anode was researched in the experiment and the results illustrated that sintering temperature has significant effect on the property of anode. The oxidation erode is stable by measuring the oxidize-weight rising curve, but there exist fluctuate on the curves which means new chemical reaction occurred and results in fast oxidization. While the results of high temperature molten erosion by emerged sample into molten salt for a long period showed that the erosion-resistance capability of sample varied with the composition of electrolyte. The electrolyte including MgF2 has high corrosion effects, which changed with the content of NaCl.