This article introduced the application of converter steelmaking simulation system in teaching practice. This system includes introduction of production equipments and production processes, and students' operation and examination. The application of this system has a better promoting effect on specialized teaching. The specialized courses of metallurgical engineering mainly contain the processes of iron-making and steelmaking, which include many process equipments, operation systems, data and charts and so on. Hence the knowledge inevitably has strong engineering background, and is hard to avoid boring and abstract. With the modern teaching method innovating and developing, the computer assisted instruction (CAI) was introduced into the class teaching. The uses of pictures, animation, etc. make the class more interesting and vivid. But the iron and steel production process and their equipments are very complex, which result in the theory teaching has defects on the intuition and practicalness [1-5]. The converter steelmaking simulation system can make simulation demonstration of the converter process. By this system, the theory teaching can be combined with the animations showing of the equipments and processes which belong to converter steelmaking. On the other hand, the students can practice the operation of steelmaking by the system. The application of the converter steelmaking simulation system is putting the theory of "teaching-learning-doing" into practice. It can enhance the students learning interest, and also obtained the good teaching result.