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Blast furnace (BF) slag is a by-product of the ironmaking process and could be utilized to manufacture slag fiber by adding iron ore tailing.The crystallization behavior of the modified BF slag is significant to the fi-brosis process.To investigate the influence of basicity on the crystallization behavior, BF slag was modi-fied by adding iron ore tailing at room temperature and melted at 1500℃.FactSage simulation, X-ray dif-fraction, scanning electron microscopy backscattered electron imaging coupled to an energy dispersive spectrometer, and hot thermocouple technique analysis were performed to explore the crystallization be-havior of the modified BF slag during the cooling process.It was found that the initial crystallization tem-perature increased with the increase in basicity.Melilite, anorthite, clinopyroxene, and wollastonite could be generated during the cooling process as basicity ranged from 0.7 to 0.9.Spinel could be found as one of the phases; however, wollastonite disappeared under a basicity of 1.0.The initial crystallization tempera-ture was controlled by the crystallization of melilite during the cooling process when the basicity of the modified BF slag ranged from 0.7 to 1.0.Moreover, the cooling rate could also influence the crystalliza-tion of the modified BF slag.