Abstract: Influences of growing process of sulfate-reducing bacteria (SRB) in seawater system on the corrosion behaviour of D36 steel were studied by detection of sulfide concentration, redox potential, corrosion potential, polarization curves and electrochemical impedance spectroscopy analysis.The results indicate that the redox potential and corrosion potential of the D36 steel do not depend on the number of active SRB, but on the accumulation of metabolism products of SRB.The anodic and cathodic reaction rate increased in the expotential stage of SRB growth and anodic reaction rate kept almost constant in the death and residual stages.