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As one of the general quality characteristics of equipment, testability has been paid more and more attention in the development of ship equipment. With the development and application of ship integrated power technology, the role of power electronic equipment is becoming more and more critical. In order to solve the problem that the testability design is not considered in the current ship power electronic equipment, the testability design and analysis method of a certain ship inverter is studied. Firstly, the structure and working characteristics of the ship inverter are analyzed, and the inverter is also divided into different levels according to the maintenance guarantee. Then the failure mode, effect and criticality analysis (FMECA) of the ship inverter are conducted, and based on the multi-signal flow diagram model, the testability model is established by using the TEAMS. Finally, the testability quantitative index is assigned to the replaceable unit, which lays a foundation for the subsequent diagnostic design of the ship inverter, and provides some references for the research on testability technology of the same type of equipment.