The slide gate plate can be categorized into Al2O3-C based, Al2O3-ZrO2-C based and ZrO2 based inserted according to the chemical difference. The slide gate plate is widely used in steel mills. It will be fast and efficient to close the gate when it detected the slag. The slag resistance rate of slide gate plate can reach 99% or even 100%, which is far higher than the traditional ways. And the slide gate plate is fully automatic to stopping slag so that we take less time and less people to operate it.