Abstract: According to the generation mechanism of the underwater corrosion-relative-electromagnetic field of submarine, a current-line which is regarded as end-to-end electric dipole is proposed to simulate the field distribution. Firstly, the underwater static electric field of a submarine model is calculated respectively by the boundary-element method and the current-line method, and the contrastive analysis of the calculation results shows it is feasible that the current-line mode is selected to estimate the underwater corrosion-relative- electromagnetic field of submarine. Then, based on the magnetic field expressions of the horizontal static electric dipole in layered-conductive media, the static corrosion-relative-magnetic field distribution of the submarine in all the space is simulated and analyzed. The simulation results show that, the near-field of the magnetic field in air is suitable to be as a new target of the aerial submarine hunting because of its measurable magnitude and obvious distribution characteristic, as well as the far-field is suitable to be as signal source for remote detection or position fixing of the degaussing submarine because it degenerates with the inverse square of the distance. The typical research results lay the foundation for the further application research.