To calculate the bearing capacities of axiallyloaded short columns of concrete filled doub-1e skin steel tubes,the lateral compressive stress the horizontal bearing stress and of the inner andouter steel pipes under the effect of axial pressure on the core concrete were analyzed by according thetwin shear unified strength theory.The vertical ultimate bearing stress of the inner and outer steelpipes was.calculated by according to the twin shear unified strength theory.Combined with bearingcapacity of the core concrete,the simplified formula to calculate the bearing capacity of short columnwas derived.Results of the theoretical formula solved by numerical method were inline with the exper-imental data at home and abroad.