Abstract: A box-shaped steel column plug-in splicing joints are investigated taking as the object in paper. On the basis of reasonable selection of node judgment criteria and material constitutive relationship, finite element software ABAQUS is used to analyze the mechanical performance of the BASE specimen under monotonous loading. Then, by changing parameters such as axial force ratio, inner tube length, inner tube thickness, flange plate thickness and pre-tension bolts forces, the mechanical properties of joints under different parameters are obtained. The analysis shows that the plug-in splicing joint is a convenient and feasible method for the column connection of assembled steel structure.