Sublance is the most important equipment of converter computer dynamic control. Converter computer control is an important way for the production reaches the high quality, high yield and low cost. To improve the economic efficiency, Tangshan medium and heavy plate Co., Ltd set three sets of sublance system. Technology and equipment design of balance (including static and dynamic control model)takes full account of the domestic metallurgical plant raw material condition, site environmental impact, technology advanced, mature, reliable,equipment and technology level. Reliable, economic, applicable advanced technology and equipment were adopted to ensure that the product quality, cost and various economic and technical indicators to achieve the world's advanced level.