Abstract: The flow behavior of molten steel in REDA and RH ladle during refining process was simulated by using computational fluid dynamics software.Flow field in refining process,circulation flow rate,Ar blowing route,and turbulent energy distributed on bath surface were analyzed.The results show that,compared with REDA,RH provides a stronger stirring at the bottom of ladle bath;the single dip pipe structure of REDA contributes to prolonged service life of dip pipe and enhance circulation flow of molten steel.Consequently,REDA can save 70% of gas flow required for RH while generating the same circulation flow rate.