The process time of hot metal ladle was measured and analyzed, and the neck of hot metal supply was pointed out when two or three converters are located in one line. The most annual capacity of one converter was calculated in different neck. The result is that three converters located in one line are not suitable for the production demand of fast converter. In the meantime, annual capacity is calculated, and the adaptability is discussed to the higher speed continuous casting about new converters layout in Japan. The references are provided for enterprise alteration in our country.