Abstract: In order to reduce the cost of smelting for 0Crl3C stainless steel which produced by one-step process (dephosphorization station + 60 t AOD +60 t LF) ,Xingtai Iron and Steel Co. Had replaced the single-slag to double-slag operation in the AOD furnace ( argon oxygen decarburization furnace) to reduce the decarbonization amount of lime. And through adding a extra lime operation after first reduction to ensure the quality of final slag steel. The results indicated that after AOD furnace from single-slag to the double slag operation, not only the influence of subsequent slag basicity change on the increasing carbon can be ignored for the low carbon 0Crl3C which with stringent carbon content is required, but also the early slag quantity decreases significantly. The using amount of Lime, fluorite and ferrosilicon respectively decreases by 1.003 ton to 1.387 ton, 0.332 ton to 0.411 ton and 0. 106 ton to 0. 177 ton for one furnace. The cost per ton of steel is reduced by 37.48 to 44.48 yuan.