Abstract: The ultimate bearing capacity of steel tube columns filled with steel-reinforced high-strength concrete under eccentric loading is investigated through 8 test speciments. The experimental results show that the bearing capacity decreases significantly with the increase of eccentricity ratio. The results also show that the bearing capacity decreases speedingly with the increase of slender ratio. The lateral deflection of composite column increases with slender ratio, and becomes significant at about 80% bearing capacity. Due to the confining force by steel tube and skeleton, the concrete bearing capacity increases. Finally, a formula to calculate the bearing capacity of composite column under eccentric load is suggested.