Abstract: Based upon the industrial test and production data, the VOD process formaking stainless steel is discussed in this paper.Temperature varition during VOD treatment was analysed.The result shows that the technical parameters influence the temperature greatly.It is important to control the temperature of oxidation period,which it depend on adjusting oxygen supply system (including lance height, oxygen supply rate and oxygen pressure) and vacuum system reasonably. The temperature dropping during reducing treatment was influe nced by the temperature after oxygen blowing,amount of additions, such as ferroalloy coolants and reduction mix,and redu-cing treatment time.A suitable range of oxygen supply rate was given to avoid splashing of steel.And also,analysing the element variation and dec-arburization reaction on the basis of thermodynamics.