High-carbon silicon has the ability to deoxidize and desulfurize, and C has the ability to increase carbon and deoxidize. The purpose of containing these two substances in the deoxidizer is to improve the quality of steel. High-carbon silicon utilizes the characteristics of silicon and carbon elements to develop the good effect of carbon elements in the deoxidation process, and obtain a composite deoxidizer based on elements with strong affinity between silicon, carbon and oxygen. It has a strong deoxidizing ability. Since high-carbon silicon is mainly composed of [Si] and [C], the generated deoxidized products are easy to float up and get rid of, do not pollute the molten steel, and can prevent the harmful effects of inclusions such as Al2O3, and also have certain deoxidation [S], [ P] ability. In addition, the [Si] content in this deoxidizer is high, and it can completely replace the current ferrosilicon alloy that consumes a lot of energy, is difficult to produce, and is expensive.