With the rapid development of domestic offshore equipment manufacturing industry and the increasing overseas projects, more and more European standard steels are applied in the field of offshore engineering. In this paper, the classification and sign of European standard steels are introduced and the European standards used in offshore engineering fields are summed up. These will help master steel standard for European series and promote the development of offshore engineering equipment manufacturing industry. Moreover, the basic principle of substitution between European standard steel and National standard steel is put forward, the differences between European standard structural steel and GB standard structural steel are analyzed, the two series of steel cannot be equivalent. The domestic offshore engineering manufacturing enterprises and steel manufacture enterprises should actively promote the development of the special national standard for the offshore engineering steel, and improve the application range of the domestic high strength steel.