Development status of continuous casting mold flux under the action of electromagnetic field. The variation of melting behavior（including melting temperature,melting rate,and melting uniformity）,rheological behavior（including viscosity,viscosity temperature curve,transition temperature）and crystallization behavior（including crystalline ore phase,crystal size and crystallization rate）of protective slag under electromagnetic field is reviewed. Based on this analysis,the relationship between the slag structure and the behavior changes under the electromagnetic field is analyzed. Finally,the existing research questions and directions for further improvement are proposed. It provides a reference for the systematic study of the metallurgical properties of the protective slag under the action of electromagnetic fields and further theoretical research.