Abstract: Based on theoretically investigate of buckling behaviour of short concrete-filled rectangular stiffened steel tubular columns under eccentric loading, the critical stress of the local buckling of the stiffened steel tubes in width and length is derived by energy approach, and the influence of the stress gradient coefficient φ, length-to-width ratios of rectangular steel tubes on the critical stress is analyzed. The results show that local buckling coefficient of the stiffened steel plates of rectangular rises insignificantly with the decrease of the stress gradient coefficient if the area of the across-section and material of columns are a constant. In addition，the eccentricity force is advantageous to the local buckling of the columns. The local critical buckling stress ratios in length to width of the stiffened rectangular steel tubes due to the stress gradient coefficient φ and length-to-width ratios of rectangular steel tube, local critical buckling will happen firstly in length of steel tube or width of ones. It’s suggested that local critical buckling stress in length and width would keep similarly and not exceed yield load fy when designing the columns.