Method for lowering converter bottom

The invention provides a method for lowering converter bottom, comprising the following steps: (1) pouring out final slag in a converter after tapping of molten steel; (2) adding semisteel and/or molten iron, fluorite and compound fluxing medium into the converter, and using oxygen to carry out slide blowing; (3) adding high-magnesium lime and/or final slag regulator to the converter, and using nitrogen for blowing; (4) pouring out slag in the converter. The method of the invention features easy operation and not only ensures furnace protection effect of splashed slag but also ensures the effect of combined blowing; regular use of the method of the invention for maintaining the converter can maintain stable and normal operation thereof.