The article presents some rules on structural classes, steel materials and welding supplies, and torsional moment for open section cold formed members according to EN 1993-1-3, as well as the National Annex of a country in Europe and Asian. From there, it serves as a scientific basis when developing National Standards as well as Design Guidelines for Vietnam for cold-formed structures according to EN 1993-1-3. Accordingly, the purpose of the study is to clarify the conversion of some steel materials and connection materials specified in the reference document of EN 1993-1-3, clarifying the torsion moment formula for structural members. Cold formed open section in accordance with other current Vietnamese Standards. Keywords: Cold formed members, EN 1993-1-3.