Abstract: Glass-ceramics were prepared from ferrous tailing as the main raw material. The effect of crystallizing temperature/time on the microstructure of glass-ceramics was investigated comprehensively by DTA, XRD and SEM. It was found that the major crystalline phase is hedenbergite existing in the sample. Which remains unchanged with increasing crystallizing temperature though the crystalline morphology and crystallization rate change greatly. Furthermore, the crystals become more regular and crystal size becomes bigger with increasing crystallizing temperature, and the crystallization rate increases first and then decreases. When the temperature is higher than 1250°C, the crystal distribution becomes less uniform, and the optimum crystallizing temperature and time are 1200-1270°C and 180 min, respectively.