Abstract: Software CFX 10.0 was used to simulate the characteristic of coherent jet oxygen lance and common oxygen lance.The advantage of coherent jet oxygen lance was proved by comparing the characteristic of the two lances.The coherent jet oxygen lance was used in the 100 t shaft EAF in Anyang Iron and Steel Co.Ltd.and the effect was analyzed.The results show that the electric consumption decreases by 30 kW·h and the advantage in oxygen consumption and production cost is obvious.Combustion cycle increases with the increase of hot metals proportion.The suggested hot metal ratio keeps about 50% because electric consumption,oxygen consumption,combustion cycle and production cost keep the similar level as hot metal ratio around 50%.