Abstract: The occurrence states and decarburization thermodynamic conditions of carbon in FeV80 alloy were analyzed,and the effects of carbon content of lime,C/V ratio,conduction time and content of decarbonizer on vanadium content in slag and carbon content in alloy were tested.Theoretical analysis results show that the main occurrence states of carbon in the alloy are VC and Fe₃C under atmospheric pressure,and the complete oxidation of carbon and reduction of vanadium can be implemented only when the system P_CO is lower than 3.2 Pa and 127.7 Pa of the equilibrium CO partial pressure of V-C-O and V-Fe-C-O system,respectively.Increasing the free oxygen activity of metal-slag interface as the dynamic hot area of carbon-oxygen reaction is beneficial for the oxidation removal of carbon in the alloy.The experimental results show that reducing the carbon content of lime and C/V ratio are conductive to decrease the carbon in alloy.The conduction time does not obviously influence the reduction of the carbon content in alloy,but decreasing the conduction time tends to prevent the subsidence of molten alloy.FeO has a certain effect on reducing the carbon content in alloy,but it is also easy to cause reoxidation of vanadium.The average carbon content of the alloy can be reduced to 0.10%,and the average vanadium content in the slag is about 1.32% at the optimum conditions.