Based on the ultimate equilibrium theory and the mechanical behavior , by introducing the equiv-alent reduced coefficient of square steel tube and high -strength concrete , and by making the constraints of square steel tube equivalent to the constraints of round steel tube , the theory research of axially -loaded ul-timate bearing capacity of square steel tube short columns filled with steel -reinforced high -strength con-crete were made .Through the yield condition and equilibrium equation in mechanics of the short columns , the bearing capacity calculation formula was derived , and then the ultimate bearing capacity was calculated . The results show that the calculated results agree with the experimental results in other references , this for-mula has good suitability and certain reference value to the preliminary design of practical engineering .%基于极限平衡理论和方钢管-钢骨高强度混凝土组合短柱的工作原理，引入方钢管等效约束折减系数和核心混凝土强度折减系数，将方钢管对混凝土的约束以及混凝土强度等效替换成相应的圆钢管对混凝土的约束以及混凝土强度，对方钢管、核心混凝土与内置钢骨在三向受力的约束效应下的轴压极限承载力进行了分析研究。利用组合短柱的力学平衡方程及屈服条件，推导出了该新型组合短柱在轴心压力作用下的极限承载力理论计算公式，并将该理论公式的计算结果与试验结果进行对比。研究结果表明：理论计算的极限承载力与试验吻合好，该理论计算公式具有较强的适应性，对此类组合短柱在工程实际中的设计计算具有参考价值。
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