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The diffusion of chloride ion in concrete determines the durability performance.Research on the diffusion mechanism of chloride ion in concrete under the combinations of applied mechanical stress and environmental actions load is closer to the real damage process and the actual diffusion behavior of concrete in service.Based on the literatures related to the durability of concrete under tensile load and chloride ion diffusion, the critical stress ratio gained by the scholars differs greatly from each other, the range is from 20% to 50%, and the extreme case is 90%.The eccentric tensile load and unstable diffusion of medium during the long term test are the reasons causing the wide variation in the critical stress ratio.A modified test rig and a new test method proposed by the RILEM 246-TDC through the comparative test were introduced in this paper.Eccentricity of tension was avoided;stable diffusion of chloride ion was realized.The change of the chloride ion diffusion coefficient of concrete with the stress ratio was obtained using the modified test rig.The diffusion coefficient of concrete under tension increases with stress ratio.When a 50% of maximum tensile load is applied, the chloride content of the layer with the same depth is higher than that without load.And when the stress ratio reaches to 80%, the chloride content significantly increase.The application of tensile load speeds up chloride diffusion in concrete.