Aiming at the phenomenon of local circumferential corrosion of concrete-filled steel tubular columns caused by splash zone in the marine environment， this paper uses the mechanical reduction method to simulate the local circumferential corrosion of steel tube wall thickness and carries out seven eccentric compression tests of concrete-filled square steel tubular columns， reveals the influence of corrosion rate and eccentricity on its eccentric compression bearing capacity， and expands the analysis of corrosion rate through numerical simulation. Finally， the reduction coefficient of eccentric compression bearing capacity based on the weakening rate is proposed， which is brought into the Chinese and American codes to calculate the eccentric compression bearing capacity. The results show that the local circumferential variable thickness of steel tubes seriously weakens the eccentric bearing capacity and lateral deflection capacity of concrete-filled square steel tubular columns. The larger loading eccentricity also reduces its eccentric bearing capacity but increases its lateral deflection capacity. After introducing the reduction factor of eccentric compression bearing capacity， the eccentric compression bearing capacity calculated according to China and the US codes is in good agreement with the experimental values. Compared with the Chinese code， the calculated method in American code is more conservative in calculating eccentric bearing capacity.