Abstract: Vanadium bearing stone coal of Guang Wang of Sichuan is more rich vanadium ore.The results of a series of studies imdicate that vanadium in stone coal is mainly present in clay minerls by V(Ⅲ).Transition of vanadium oxidation state during roasting is the key of the process of extracting vanadium from stone coal.It affects directly the rate of V(Ⅲ)oxidised into V(Ⅴ),and the ratio of dissolvable vanadium,and all vanadium in products roasted,and the deposition of vanadium.The factors that decide the transition of vanadium oxidation state during roasting are mainly the temperature and atmosphere and reducing substances such as pyrite in vanadium bearing stone coal as well as the means that vanadium existing stone coal.