Copper slag is a by-product obtained during smelting of copper from copper ores. In China, for one ton of metal production about 2.2 tons of copper slag has generated, and approximately 15 million tons slag is produced in 2013. Dumping and disposal of such huge quantities of slag will cause environmental and space problems. Most importantly, copper slag can not be made full use of to maximize its value. In this research, copper slag is used as the main material to take the place of scrap iron and part of silica in traditional process. Utilizing silica and copper slag from Jinchuan corporation as the main materials and coke as reducing agent, FeSi45 is produced in induction furnace. In addition, the effect of different carbon content on FeSi45 has been investigated，showing that silicon content tends to increase with increasing carbon content.