Abstract: According to low consumption of scrap consumption in semi-steel smelting converter at Panzhihua Steel caused by insufficient heat source of semi-steel, by calculating the heat balance of the converter,the theoretical scrap consumption under different semi-steel conditions and the corresponding relationship between the end-point carbon,temperature and scrap consumption are obtained.By charging silicon in semi-steel and using carbon during blowing for thermal compensation and adopting technical measures of optimized slag charging system,reducing tapping temperature,the carbon content at the end-point of molten steel has increased from 0.048% to0.068%,BOF tapping temperature reduced from 1658 ℃ to 1638℃,in the case of a lower material consumption of per ton steel,the dephosphorization rate increased by 1.1 percent- age point on average,and the scrap consumption increases from original 38.9 kg/t_钢 to 68.7 kg/t_钢 as well.