Abstract: Due to high vanadium content in Chenggang blast furnace slag,the influence of vanadium on properties of viscosity,melting temperature and desulfurization was investigated in this paper.The results show that when V₂O₅ content increases,the slag possesses short slag feature,slag viscosity increases to a certain value and then decreases,but the melting temperature continues decreasing,.When the tempera-ture is higher than the melting temperature,increasing V₂O₅ content leads to viscosity reduction,which is good for production.Slag viscosity decreases with the temperature increasing.The higher the temperature is,the smaller the viscosity difference.Increasing temperature accelerates the desulfurization reaction.V₂O₅ content of blast furnace slag has little effect on desulfurization.