The problems of the land occupation and the pollution of environment caused by discarding the LF spent slag are becoming serious. Therefore， it is important to study the recycling of LF spent slag. This paper analyzed the research status of recycling of LF spent slag and the major problems with the melting and solid state. It is con- sidered that the focus of future research is to remove the sulfur containing in LF spent slag; the molten spent slag should be poured into other vessel and the sulfur in the molten spent slag would be removed by blowing air directly into it. It would be available to remove sulfur from solid spent slag by means of hydration and oxidation on condition that the slag had been dealed with a certain basicity and cooling method and the sulfur in slag had been existing with the form of CaS.