The effects of surface adjustment on salt spray corrosion,water quality on surface adjustment and aging of surface adjustment tank were studied.The results show that the salt spray performance of the electrophoretic coating can be effectively improved by surface adjustment.In the process,the electrical conductivity of the tank is less than 2000μS/cm,which can improve the quality of phosphating and anti-corrosion performance of the cavity.The aging degree of the tank can’t be evaluated only by the pH and titanium content.