Abstract: The corrosion properties of 05Cr17Ni4Cu4Nb, 0Cr16Ni5Mo and ZG03Cr26Ni7Mo4N stainless steels in natural seawater were studied by electrochemical test, crevice corrosion test and galvanic corrosion test, combined with corrosion morphology observation, corrosion rate calculation and potentiodynamic polarization curve. The results show that when the three types of stainless steel materials were coupled in pairs, their corrosion rates did not change significantly compared to their free corrosion rates, the galvanic potentials rapidly shifted positively and reached stability, and the galvanic current was far less than 0.3 μA/cm². Therefore, when the three stainless steel materials are used in couple, galvanic corrosion will not occur, and there is good matching performance among the materials.