Danger local buckling (LPA) are virtually ignoredin most engineering methods for calculating the cross-section profiles with complex shapes. The problem of LPA rod is reduced to the problem of overall sustainability. At the stage of design of thin-walled sections structures, it is important to have a simple device for assessing the carrying capacity of a particular size. The article discusses the different methods of calculation of thin-walled structures, and the calculation results in a PC SCAD on general and local resistance. It was tasked to determine the dependence of LPA on various parameters section and the degree of influence on the LPA repeaters wall, to analyze the difference between the reserve general and local stability of the system.