Abstract: The final carbon control of a 45-t electric arc furnace was studied, the melting process and oxygen system were optimized, and the foaming slag process was improved. Therefore, the pass rate of carbon content in the molten steel is obviously improved in the end of oxidation in EAF, the addition of deoxidizing material is reduced, and the oxygen content decreases to some extent in LF. By improving the foaming slag process, there is almost no cold steel on EAF roof, the leakage of water-cooling parts decreases greatly, and the hot stopping time is reduced.