This chapter presented the modeling and the finite element analysis of linear elastic buckling of different cold formed steel sections using the so-called (cFEM) software,. tThe sections were analyzed with different shapes, such that C-section, LSB section, column, or beam with various lengths, starting from short to intermediate, and also long, thin-walled, cold formed steel has been analyzed, the width of the lips, the flange and web, and different perforation pattern,/