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The performance of beams causes that the energy received by other structural members is reduced and as a result, they do not undergo much deformation. The reason for this is the strength created in the wing and beam due to their location. On the other hand, the property of increasing resistance against the loads caused by buckling, which causes local destruction in the beam-column, is one of the most desirable features of delta beams, which, in this way, reduces the damage caused by seismic loads in the structures. , minimizes Based on this, the purpose of the current research is to evaluate the amount of bending buckling load of the stiffened section with delta sheet beam. In this research, using the numerical calculations and modeling done in ANSYS software, along with the influence of the cross-section geometrical characteristics on the resistance of sheet beams, to the changes in the height of the sheet beams using MA and moment-moment change charts of longitudinal and delta stiffeners. and then by using elastic and non-linear buckling analysis and economic (flexural strength index) and technical (optimal dimensions of delta and plain beam) analyzes and according to the findings obtained from the analyzes Flexural buckling of delta sheet beam and its comparison with simple sheet beam is discussed. In places where the use of long beams is used and it seems necessary, the use of sheet beams is recommended, because, in cases where the length exceeds five to six meters, the increase in length has a special effect on the critical buckling moment. It will not have; So that its effect can be ignored.