Abstract: On the basis of theoretical analysis, the reaction mechanism of FeO and V₂O₅ is studied by differential scanning calorimetry (DSC), high-temperature quenching and X-ray diffraction analysis (XRD).The experiment results indicate that V₂O₅ is broken down into V₂O₃ and oxygen, FeO is oxidized to Fe₂O₃, V₂O₃ reacts with FeO to form FeV₂O₄, V₂O₅ reacts with Fe₂O₃ to form FeVO₄, V₂O₃ reacts with FeO and Fe₂O₃ to generate Fe₂VO₄.Fe₂O₃ and V₃O₅ are formed when the temperature is between 830℃ to 970℃ and the mass percent of the FeO is less than 50%, FeVO₄ is formed when the temperature is between 970℃ to 1 270℃ and the mass percent of the FeO is between 50% to 70%, Fe₂VO₄ is formed when the temperature is more than 1 270℃ and the mass percent of the FeO is more than 35%.