Girders with singly symmetric sections are more efficient and economical then the double symmetric sections. However, the theoretical moment calculations for singly symmetric sections are not an easy task. The difficulty comes from some of the evaluation of torsion properties. Current AISC specifications [1, 2] are not provided the theoretical formulas for the critical moment curves of singly symmetric girders. In AISC specification , which revisions the residual stress design to influence the limiting buckling moment strength. This study introduces the singly symmetric girders design methods with theoretical and design manual, and compared the limiting buckling moment with the specification of AISC [1, 2]. It will enable practicing engineers to perform more in-depth evaluation in their routine deigns.