Abstract: The corrosion resistance of Q235B, SPA-H steel and two weathering steels with different alloys contents of Ni, Cr and Cu in simulated marine atmosphere environment were studied by scanning electron microscopy and electrochemical impedance spectroscopy. The results show that only adding Cr was beneficial for retarding corrosion in the early stage, but promoting corrosion at the late stage in the environment of Cl-when the Ni and Cu contents were very low. The effect of Ni on corrosion resistance couldn′t afford leading role when the mass fraction of Ni was less less 0.25wt%. The result of electrochemical impedance test was agreement with the result of the corrosion mass loss test. The rusting of the four steels were small after periodical immersed corrosion for 48 h, and the rusting obviously increased after corrosion for 192 h.