Abstract: In this paper, the developing process of deformation and stress in eccentrically loaded reinforced concrete columns under sustained load is described. A new nonlinear creep model for concrete is given based on the experimental results. A step-by-step method is used to analyse the deformation, stress and their redistribution by computers. In the analysis, the nonlinear property and second moment effects of slender columns as well as the redistribution of stress and strain are taken into accounted. The error between the experimental and the calculated results is tolerable.