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It is important of research and analysis on vessel integrated electric power system’s testability design and analysis to improve the weaponry’s testability level, strengthen the equipment system’s usability, increase the combat readiness and reduce the life cycle cost. This paper starts analyzing the development of BIT at home and abroad, builds test model on vessel integrated electric power system and divides level. The system is divided into three parts, the generator, the excitation system and the rectifier system. Each subsystem’s fault models are analyzed in detail and the test parameters and test points are put forward in engineering practical aspect. The system’s process of condition monitoring, fault detection and fault isolation are designed. Finally, the system-level BIT structure diagram is proposed in terms of reducing the rate of false alarm, laying a solid foundation for the follow-up test research of electromechanical equipments.