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By analyzing the relevant influencing factors of the testability level of equipment, building an interpretation structure model, exploring the correlation between the influencing factors of equipment testability, using the "means end analysis" method to identify the five key influencing factors that affect the testability of equipment, and through the analysis of the complexity of equipment system, the technology and management level of the developer, the development funds, the interface compatibility between test subsystems, and the rationality of the selection of test points, Provide countermeasures and suggestions for improving the testability level of equipment.