Abstract: In order to reduce marine shaft-rate electric field influence and the exposure rate of the ship, the mechanism of the electric field is analyzed in this paper, along with the principle of the active compensation system.Specifically, the electrical properties are studied based on the analysis of the mechanism of shaft-rate electric field of the ship.The ship shaft-rate electric field suppression is proposed according to the compensated negative potential.The framework and function framework of the system are designed.The weak signal monitoring and processing technology of ship shaft is investigated, and the judgment and control technology of the system is studied.The driving and power output module of the negative potential is designed, where the simulation results show that the ship shaft-rate electric field can be suppressed effectively with the proposed system, and the stealth property of the ship is simultaneously enhanced.