Abstract: The L-shaped column made of stainless steel sandwich panel with core tubes is a new type of special-shaped column, which makes full use of the advantages of sandwich structure and stainless steel. In this paper, the influence of the panel thickness, the wall thickness of core tube and the spacing of the core tube on the stability of the L-shaped column was studied. The finite element software ABAQUS was used to establish the finite element model and simulate its axial compression performance. The eigenvalue buckling analysis and nonlinear buckling analysis were carried out respectively. The buckling mode, deformation and loading-displacement curve under single sectional parameter change were analyzed. The research showed that the buckling mode of the L-shaped column was flexural buckling, and its failure mode was local buckling failure. With the increase of the panel thickness, the constraint of the core tubes to the panel became weaker and weaker, and the contribution to the stability became smaller and smaller. At the same time, it was found that the influence of the wall thickness of the core tube and the spacing of the core tube on the stability was obvious.