A theoretical model adapted for studying steel continuous casting technology was proposed.The model based on system theory contained input/output,command,and control parameters.The process was divided into five stages,i.e.,tundish,mold,guiding system,guiding-drawing system,and guiding-drawing-soft reduction sys- tem.The model can be used to describe the physicochemical processes,thermal processes,chemical processes,and characteristics of the cast material according to the above-mentioned stages.It can also be applied to other metallur- gical technologies and even to other industries (chemistry,food,etc.). A theoretical model adapted for studying steel continuous casting technology was proposed. The model based on system theory contained input / output, command, and control parameters. The process was divided into five stages, ie, tundish, mold, guiding system, guiding-drawing system, and guiding-drawing-soft reduction sys-tem. The model can be used to describe the physicochemical processes, thermal processes, chemical processes, and characteristics of the cast material according to the above-mentioned stages. It can also be applied to other metallur- gical technologies and even to other industries (chemistry, food, etc.).