Abstract: The corrosion depth of CuNiSiCr alloy was measured by static weight loss method in man-made sea water.The polarization curve and the corrosion current were studied in acidic,neutral and basic solution.The corrosion morphology was studied by means of SEM and the corrosion products were analyzed by means of EDS and XRD.The results showed that with the prolongation of corrosion times,the corrosion rate of CuNiSiCr alloy decreased in man-made sea water.The alloy was not eroded partially and the corrosion rate was 0.0111 millimeter per year and the corrosion grade was four.Anti-corrosion of CuNiSiCr alloy was best in acidic solution and the main corrosion product was CuCl₂.