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The inverter is the core part of the motor drive system, its safety and reliability are crucial to the normal operation of the motor drive system and the whole control system. In view of the fault for switches in inverter, this paper reviews the existing diagnostic method for open-switch faults in inverter based on analytical model, signal processing and data-driven. The principles of each fault diagnosis method are described in detail and these methods are compared from the perspectives of application, diagnosis time, algorithm complexity and reliability , and their advantages and disadvantages are highlighted. Finally, the difficulties and trends of the research on fault diagnosis of inverter are discussed.