In this paper,the CHE507 RCW electrode deposited metal with different Cu content was taken as the research object. Firstly,the microstructure of the deposited metal was observed by metallographic microscope,and then the weight loss corrosion experiment was carried out by simulating the corrosive environment of the cargo tank of the oil tanker. The corrosion behavior of the sample in the high acid and high Cl-concentration environment was studied. The effects of Cu content on the corrosion resistance of the weld samples were studied by means of electrochemical analysis and scanning vibration reference electrode technique（SVET）. The results show that the microstructure of the deposited metal consists of ferrite + a small amount of pearlite + a small amount of second phase particles;the sample undergoes hydrogen evolution corrosion at the initial stage of the reaction,and pitting occurs with the prolongation of corrosion time;Inside,with the increase of Cu content,the microstructure of the deposited metal tends to be uniform and fine,the precipitates at the grain boundary become less,the self-corrosion potential gradually shifts,the self-corrosion current gradually decreases,the corrosion resistance increases,the surface corrosion products become dense and the pitting corrosion resistance is enhanced.