Abstract: For effective removal of washing powder coal sulfur content in based on the characteristic analysis of and desulfurization process of Nantong Coal Preparation plant transformation. Based on the table of desulfurization process have been put into application,coal ash decreased 6 to 8 percent,sulfur content decreased by 0. 3 to 0. 6 percentage points,the annual reduction 0. 98 million yuan of fuel sulfur reducing cost; in addition,average monthly production of sulfur concentrate 250 t,the grade between 25% ~30%,average annual can make into the air amount of SO₂ reduction of 1 500 t,significant social benefits.