Abstract: The corrosion behavior of E36 ship plate steel with different carbon contents and alloying element contents was investigated in solution with high concentration of Cl- (10%) by weight loss method,polarization curve, electrochemical impedance spectroscopy (EIS) and SEM. The results show that the corrosion rate of ultralow carbon steel was lower than that of low carbon steel, the corrosion rate of ultralow carbon steel with adding Cr element (1#) was lower than that of 2# without Cr, while the conosion rate of 3# with adding Cr and increasing carbon content together was maximum. It shows that in low chromium range, decreasing the content of C is more effective than increasing the content of Cr.