Abstract: In order to study the oxygen jet in BOF steelmaking, the software FLUENT 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. In a 35 t converter, coherent jet oxygen lance carried out a preliminary industrial test. The results demonstrated that the coherent jet oxygen lance solved the behavior of high phosphorus successfully, and the consumptions of steel stuff and oxygen were declined.