Abstract: The chloride ion corrosion has a great influence on the seismic performance of existing RC structures in salt fog environment. The artificial climate experiment method is used to simulate an offshore salt fog environment to accelerate the corrosion of 8 short-pier RC shear walls with a shear span ratio of 2.14. After achieving the anticipated corrosion target, pseudo-static loading tests are carried out, focusing on the influence of salt fog corrosion degree on the bearing capacity, deformation, strength degradation, stiffness degradation, energy dissipation and other indicators of the shear wall specimens. And the influence of different design parameters on the seismic performance of corroded specimens are also studied. The test results show that corrosion has a great influence on the seismic performance of RC shear walls. With the increase of corrosion degree, the specimens are gradually changed from shear failure to bending failure; the bearing capacity, deformation capacity and energy dissipation capacity of specimens decreases; and the strength attenuation and stiffness degradation increases. Nevertheless, reducing the transverse distribution of steel bars can effectively improve the deformation capacity of corroded RC shear walls, and limiting the axial compression ratio of shear wall can also effectively improve the seismic performance of corroded RC shear walls.