Abstract: In order to study the degradation law of mechanical properties of reinforced concrete eccentric compression member, the mass and bearing capacity of reinforced concrete eccentrically compressed members under load-wet-dry alternation-sulfate and chloride coupling corrosion environment were tested by coupling loading device of stress and corrosion, and the effects of ion concentration, wet-dry conditions and load level on the macro-performance of the members were analyzed.The results demonstrated that the chloride inhibited sulfate corrosion in the initial stage of corrosion, but significantly reduced the cross-section bearing capacity in the later stage.The load accelerated the degradation of bearing capacity of eccentrically loaded reinforced concrete columns in corrosive environment, and the load level was positively correlated with the degradation degree.This study serves as a reference for the safety evaluation and lifetime prediction of underground reinforced concrete structures