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Mold flux plays an important role in the continuous casting of steels to protect the steel from air reoxidation, to lubricate between the solidified steel shell and the copper mold, to control the heat transfer near the meniscus, and to remove the non-metallic inclusions for the last chance in steel production. In general, CaO–SiO2-type mold flux is widely used in steel continuous casting mold due to its good performance for the lubrication. However, the existence of a large amount of SiO2 in the mold flux easily leads to some intensive interfacial reactions between SiO2 and some reductive elements in different steel grades. Chemical reactions will change the composition of the mold flux as well as the mold flux properties during a casting process.1,2) The composition change is a very complex process which involves interfacial reactions and mass transfer. In addition, these phenomena might also be influenced by the existence of the interfacial tension between steel and mold flux. During continuous casting process, the changes of mold flux properties may lead to unstable heat transfer and insufficient lubrication, which might result in severe surface defects Mathematical Modelling Study of Dynamic Composition Change of Steel and Mold Flux in Continuous Casting of Steel