Abstract: Due to the limited amount of bauxite and the depletion of high-grade bauxite in China,the high grade sulfur bauxite will be the main mineral raw material for alumina production in the future.Sulfur which is one of the important impurities in bauxite affects alumina production index.Study on ore properties and occurrence status indicated that the sulfur in alumina ores mainly occurs as pyrite.The high sulfur bauxite cannot be directly put into alumina process for its high sulfur content.In this article,the method of flotation was used in the desulfurization of high sulfur bauxite under the coal seam.Single factor experiments,which mainly focused on grinding fineness,ore pulp concentration,pH value,and BKS-SNS concentration,were done to find the optimum technological conditions.The Results showed that the optimum grinding fineness (-0.075 mm)was 75 %,while the optimum ore pulp concentration was 25%,and the optimum pH value was 9.0,and the optimum BKS-SNS consumption was 2000g/t.Under the optimum technological conditions,the alumina recovery rate was 94.13%,while alumina-silica ratio and sulfur con tent of the concentrate were respectively 6.01 and 0.35%,which can fulfill the requirements of alumina production.The flotation desnlfurization technology not only providing the quality of available resources to alumina production,while achieving efficient use of sulfur-containing minerals,turning process waste into useful material,has significant environmental and social benefits for the protection of mine environment and high-sulfur bauxite green alumina production technology.