The liquid steel yield was improved and smelting cost was reduced by optimizing smelting operations, utili- zing equipment advantage, decreasing the BOF terminal oxygen content and controlling strictly the terminal composi- tion at Nanjing Iron and Steel Co., Ltd. The cost of BOF smelting was reduced by 62.52 yuan/t(steel) and the consumption of hot metal and scrap was reduced to 1 087.2 kg/t. So the market competitiveness of NISCO was im- proved in iron and steel works and the significant benefit has been gained.