Abstract: The production flowsheet of test stainless steel 20Crl3 (/% : 0.20C, 0.37Si, 0.54Mn, 0.030P, 0.002S, 12.22Cr, 0.007Al) is 25 t EAF-VOD-LF-ingot casting. The effect of [Si] and slag basicity on (Cr₂O₃ ) content in slag and the desulphurization efficiency of slag by silicon deoxidation process have been analyzed. The calcium yield for stainless steel 20Cr13 by VOD-LF with Si deoxidation refining process is 99. 27% , the [ S] at LF refining beginning is 0. 014% and at end refining [ S] is 0. 007% to meet the requirement of actual production and save the consumption of aluminium ingot and high-carbon ferrochrome and decrease the production cost of stainless steel 20Crl3.