It has the functions of desulfuration, deoxygenation and adjusting slag performance of steel slag in steel ladle. It also helps to realize the purpose of refining and purifying the molten steel by reducing the content of oxide among steel slag. Meanwhile the final slag modifier of converter is of good fluidity good and good spreadability, and can replace the steel ladle covering agent; and the active aluminum slag agent can be further deoxidization, so the final slag modification agent also has the change of slag, the action of removing impurity in steel. To improve the service life of converter in refractories, the tap-to-tap time is speeded up, the production efficiency of converter is improved. MGO percentage composition：40%-65% Carbon percentage composition：5%-20% Specification: 10mm-30mm, 30mm-40mm