The method of manufacturing glass-ceramics by using steel slag as a major raw material was described. The flexural strength and bulk density of the glass-ceramic at different nucleation temperature was measured. The range of nucleation temperature and crystallization phase identification were done by using DTA, XRD and SEM. The relationship between nucleation temperature and flexural strength and density was investigated. The results show that with the increasing of temperature, the content of crystal and flexural strength of the glass-ceramics increase and until reaching a maximum value, they turn to decrease. The method of manufacturing glass-ceramics with steel slag is a new and effective way for comprehensive utilization of steel slag. （From : No.2, 2006 Glass & Enamel )