Abstract: Experiment on axially loaded 22 steel tube confined high-strength concrete columns (STCC) was carried out．The formula for the initial compressive stiffness of STCC proposed by Technical specification of high-strength concrete structures is verified．The empirical formulas for peak stress，peak strain，plateau stress and the strain at the starting point of plateau of steel tube confined high-strength concrete with the confinement index of 0.28~1.1 are obtained．The equation for complete axial compressive stress-strain curve of steel tube confined high-strength concrete and its parameters are suggested．

Keywords：Steel tube confined high-strength concrete; peak strength; peak strain; plateau stress; stress-strain curve