Abstract: A nonlinear finite element analysis（FEA）was developed to simulate the axial-column of concrete-filled stainless steel tube（CFST）subjected to long-term sustained loading；the established FEA was verified by experiment in this paper. With FEA，the influence of long-term loading on the mechanical behavior of the CFST axial-column was researched in terms of the relationship between load and deformation，and the interaction of specimen materials was studied，the behavior of the CFST axial-column with long-term loading was compared with that of the CFST axial-column without longterm loading. The results showed that the long-term sustained loading increased the bearing capacity of CFST axial- column and increased corresponding axial deformation，and delayed the occurrence of interaction between stainless steel tube and core concrete.

Key words: concrete-filled stainless steel tube, long-term sustained loading, axial-column, finite element method, mechanical property