Combined with the actual maintenance support needs,the control principle of the control subsystem for three-electrode minesweeping gear of a certain type of ship is analyzed in this paper. An effective debugging method for the control subsystem in automatic mode in wharf environmental is put forward.The debugging control system is built. Combined with equipment maintenance support,the controllability of the excitation output of the control subsystem has been fully tested. The maintenance efficiency of the control subsystem in wharf environment is improved,thereby the integrity of the equipment is ensured.