Electric furnace steelmaking has the characteristics of high arc temperature, drastic temperature changes in the furnace, and complex slag composition. The working environment of the furnace lining is very harsh, so the quality and construction technology requirements for furnace materials are very high. Strict material control must be carried out before starting work; When setting up positioning lines and various construction marker lines, ensure accurate measurement; The steel outlet and breathable bricks are made of composite bricks, which need to be pre assembled to ensure the quality of masonry; The ramming materials for each part shall be uniformly compacted according to the process specifications.