The chemical and electrochemical equilibria in the presence of gaseous phase were investigated. Many substances, which consisted of sulphur and chromium, were considered. Various thermodynamic equilibria were cal- culated in different pressures. Calculation results were shown as log p ?l/T and F-T diagrams. These diagrams may be used to study the corrosion of chromium in sulphur-containing circumstances. The diagrams are also used to ther- modynamically determine the existence area of various substances and so on. The chemical and electrochemical equilibria in the presence of gaseous phase were investigated. Many substances, which consisted of which sulfur and chromium, were considered. Various thermodynamic equilibria were cal- culated in different pressures. Calculation results were shown as log p? L / T and FT diagrams. These diagrams may be used to study the corrosion of chromium in sulfur-containing circumstances. The diagrams are also used to ther- modynamically determine the existence area of ​​various substances and so on.