The oxidation rules of carbon,silicon and boron in Fe-C,Fe-C-Si,Fe-C-B and Fe-C-Si-B melts under oxygen blowing were studied respectively.The experiments were carried out at temperature of 1 450±25 ℃.The results show that silicon and boron in boron-containing iron melt were oxidized first,and after the experiment proceeded to a certain extent,carbon was then oxidized.The oxidations of silicon and boron in boron-containing iron proceed at the same time and affected each other.