Oxygen concentration and seawater conductivity are important factors affecting the corrosion behavior in seawater, and these two factors mainly depend on salinity and temperature of seawater. The model of impressed current cathodic protection and corrosion electrostatic field was established by using the boundary element method. The effects of oxygen concentration, seawater conductivity and diffusion coefficient of oxygen on the corrosion related electrostatic field of the ship at different seawater temperatures were studied. The results show that the peak value of the corrosion electrostatic field decreases with the increase of temperature. When the output current of the two pairs of anodes are 13.5 A and 8 A, respectively, the hull and the rudder are in overprotection at low temperatures and underprotection at high temperatures accordingly, but the propeller and the shaft get perfect protection at all temperatures.