Abstract: According to the characteristics of the rolling and casting process in BOF special steel plants, the rolling plan compiling rules were described. The heuristic algorithm based on the rules for rolling production planning optimization was put forward, and some procedures to make the plan were given out in detail. On the basis of the analysis of real production state, cast plan compiling rules were described, and the model of cast plan optimization was established. Moreover, the overall design and technology realization of a production planning system were processed. By using Delphi 7.0 and SQL Server2000, the production planning system was developed and applied to one medium-sized converter special steel plant, and its practicality, reliability and versatility were proved in practice.