Abstract: This study applies statistics,mathematical correlation analysis and cybernetics to parameters control and data processing in BOF steelmaking process. The mathematical analysis is combined with steelmaking theory,so as to obtain the equivalent relation between process parameters,lining materials and lining life,and establish mathematical model of Pangang's BOF lining life. The model has been used to control factors affecting lining life,resulting in an annual increase of 10%in Pangang's BOF lining life during the recent four years and marked improvement in BOF productivity.