Abstract: This article is rewritten through retreating even more equilibrium data of desulphurization on the basis of the same title paper published in the proceedings of The First Chinese Conference on Phyngsical Chemistry of Process Metallurgy in 1962. As a result of using thermodynamic data for di fferent binary （MeO-SiO2） Slags at variaus temperatures, a satisfactory relationship between the constants of desulphurization and temperatures has been obtained.