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The characterization of chloride penetration in concrete exposed to composite solution of 5%NaCl+5%Na2SO4 attack under flexural loading and drying-wetting cycles was investigated in this paper.The flee chloride concentration and chloride diffusion coefficient (De) at the different cover depth and erosion age of concrete exposed to composite solution attack were analyzed.It was shown that the free chloride concentration of concrete increased with the increasing of erosion age at the same depth of concrete and decreased with the increasing of the cover depth of concrete at the same erosion age.Compared with long-term immersion,drying-wetting cycles could accelerate the chloride penetration in concrete.The influence of flexural loading on the resistance of chloride erosion of concrete was determined.