Abstract: The oxygen element is harmful to Si steel,and the RH refining deoxidation method has an important effects on oxygen concentration. Based on the industrial non-oriented Si steel containing Al,the effects of RH refining deoxidation method on non-metallic inclusions was investigated. The results show that the oxygen concentration in liquid steel from Si-Al deoxidation sequence method is higher that of AlSi deoxidation sequence method. The average yield of Si and Al for Si-Al deoxidation sequence method are 90.7% and 78.2%,respectively,and those for Al-Si deoxidation sequence method are 97.5% and 63.7%,respectively. The Si-Al deoxidation method is superior to the Al-Si deoxidation method in terms of Si and Al yields. Thus,from the viewpoint of controlling magnetic properties,Si-Al deoxidation sequence method is recommended. The major non-metallic inclusion is composite of MnS and Cu_xS generating from Si-Al deoxidation sequence,and individual Al N and complex Mn S and Al N inclusions dominate in Al-Si deoxidation sequence. Average inclusion sizes are 0.73 μm from Si-Al deoxidation sequence and 0.38 μm from Al-Si deoxidation sequence.