Abstract: The effect of steel slag powder proportion and curing process on compressive strength of solid waste concrete was investigated. The microstructure of hydration products was analyzed by SEM. The results showed that, steel slag content has great influence on the compressive strength of concrete. Steam curing can effectively stimulate the activity of steel slag and improve the early strength of gelling material. Mixed with 20% steel slag, curing at 56℃, the compressive strength of the concrete can achieve 77.26MPa at 28d. The addition of steel slag power has no effect on the type of hydration, the coordinated growth of the ettringite and C-S-H gel is significant for the strength of system in the middle and late stage of the reaction.