Abstract: A discrete system simulation mathematical model describing the steel ingot process from teeming to rolling has been developed in this article a-ccording to the source material which was abstracted from on month is recording data and production schedule of a blooming mill. A good many simulation calculations and procedure research have been made with this model on the computer. The simulation results are agreement with the practical data. It is cleavthat this model is satisfactory with the steel ingot process. The mathematical simulation model and its simulation results can supply a decision basis for technicians of production schedule and m-anagement in rolling mill, and also can prouide refrence for system researcher of process control.