This study investigates the bias performance of stainless steel tube ultra-high performance concrete (UHPC) columns using a combination of experimental, numerical simulation and theoretical analysis. The experimental results show that the increase in L/D ratio and eccentricity reduces the bias load carrying capacity and ductility, while the increase in steel content and casing coefficient enhances the performance of the columns. The study divides the bias stress process into three stages: elasticity, elastoplasticity and load drop, and analyzes the mechanical characteristics of each stage. In addition, the applicability of the current codes to stainless steel tube UHPC columns was verified in conjunction with relevant codes and literature at home and abroad, and it was found that some of the literature formulas were calculated with higher accuracy. The study provides theoretical basis and practical guidance for the design and application of stainless steel pipe UHPC columns, which has important engineering value.