Abstract：In order to meet the increasingly stringent environmental protection requirements of International Maritime Organization (IMO) and various countries on carbon, sulfur, nitrogen emissions, Diesel- Electric hybrid power system ships, as a new energy ship type, begin to receive extensive attention and application. This paper describes the design and Application Research of ship Diesel- Electric hybrid power system, including diesel generator sets and energy storage system (including power battery pack, battery management system, battery room fire extinguishing system) system composition, equipment configuration, system operation mode, battery room arrangement, etc., in order to provide solutions for shipowners and shipyards facing environmental pressure.