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VIF characteristic curve, that is, volt-ampere-frequency characteristic curve. Discrete components or integrated chips are the smallest quarantinable unit for board failures, and component damage or characteristic changes are the most fundamental cause of board failure. According to the problem of component parameter acquisition, the method based on VIF characteristic analysis is used to analyze the common components, and the common fault modes are simulated. The characteristics of VIF characteristic curves are analyzed, and the curve of various combinations of components is summarized. The capacitive faults and inductive faults of the circuit board of the fire suppression and explosion suppression system were diagnosed and the effect was remarkable.