The silicon calcium alloy is one kind of good compound deoxidization and a desulphurization reagent for steel making. In order to prevent the ladle nodulation, instead of the aluminum, the silicon calcium alloy is often used in making continuously casting steel, which mostly to carry on the steel fluid deoxidization, large scale enhance the cast performance and the machine capability. The silicon calcium alloy is also suitable for the warming agent in the converter steel-making plant and served as inoculants for the grey cast iron and chemical additive for the modular cast iron.