The static axial compression tests of spot welding square copper tubular components were conducted to study the mechanical property of spot welding components used in shaking table tests. Several components with two kinds of sections were designed. It is found that the components were in elastic phase when they yield, but the change of widthtothickness ratio is different. Based on this study, the finite element analysis models of representative samples was created. The buckling behavior of thin plate with spot wielding boundary condition was studied and the relation between separation distances of welding spots and buckling coefficient was obtained. Besides the compression of components with different widthtothickness ratios and separation distances of welding spots was simulated. The analysis results show the influence of these two parameters on the mechanical property of components.