Based on the macro-element of fiber model and open source software OpeenSEES, the hysteresis curve of circular concrete-filled steel tube columns(CFST) between lateral load and displacement under low cyclic static statement are given with numerical simulation in this paper; it proved that the results predicted by the model were in good agreement with that obtained from experiments. The influences of parameters including steel ratio，axial compression ratio and material strength on hysteretic skeleton curve and on seismic behavior of circular concrete-filled steel tube columns were analyzed. The results showed that increasing steel ratio led to higher bearing capacity and elastic stiffness, increasing axial compression ratio led to inferior ductility and seismic behavior, and increasing steel strength led to higher bearing capacity except for low strength concrete whose strength showed no obvious effect on bearing capacity and elastic stiffness distinctly.