Based on the equivalent dipole method, the analytical formula of compensation dipole field was given from the length, the angle and the size of compensated dipole. The electric field model of “corrosion dipole + compensation dipole” was established by using the principle of charge vector superposition. The simulation was taken to verify the validity of the “corrosion dipole + compensation dipole” electric field model, then to verify the influence of the compensate dipole on the ship′s electric field, finally the optimal solution was obtained. The test results show that compensation effect is the best when the compensation anode is farthest away from the terminal of compensation system, and the compensation system is parallel to the horizontal plane; as well as the original ship corrosion electric field can be offset theoretically under the compensation optimal condition.