The present research is to investigate experimentally the non linear behavior of tubular thin wall pylons with polygonal sections. A total of nine specimens was tested to failure under an axial compression loading. Some parameters such as the geometrical imperfections and residual stresses, likely to influence the phenomenon of local buckling were taken into account. A theoretical study based on empirical formulas of the various design standards is presented to predict local buckling strength of thin-walled tubular members sections under axial compression loading. Results obtained using theoretical study are compared to the results from experimental tests. This report include primarily a review of literature on the stability and the behavior of the thin-walled tubular members under axial compression loading, a design approach in accordance with various standards and a series of laboratory tests.