Abstract: In order to study the influence of corrosion degree on the bearing capacity, deformation capacity and ratio of shear deformation to total horizontal displacement of squat RC shear wall due to chloride ion erosion, the artificial climatic simulation technology was used to accelerate the corrosion of five squat RC shear wall specimens, and then a quasi-static loading test was carried out. The results show that under the action of chloride ion erosion, the cracks along the longitudinal reinforcement direction of the concealed column increase in quantity and become wider in width than that along the stirrups and distribution reinforcement direction. With the corrosion rate of lateral distribution reinforcement increasing from 0% to 16.56%, the bearing capacity, deformation capacity, ductility and other aspects show different degrees of degradation, of which the bearing capacity is weakened by 12.6%, the ductility is reduced by 23.0%. Simultaneously, the ratio of shear deformation to total horizontal displacement under cracking, yielding and peak points all show a growing trend, the average ratio of the three points is increased from 22% to 36%, and the brittle failure characteristics are more obvious at the time of failure. The research results obtained can provide a theoretical support for both the aseismic performance study of corroded squat RC shear wall members due to chloride ion erosion and the life-cycle aseismic performance evaluation of RC structures with squat shear walls.