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Testability model is the basis and key in implementing testability simulation, design, analysis and evaluation. This paper introduces the modeling methods of equipment testing and the testing procedure in simulating software, to achieve the purposes of realizing the testing analysis and failure diagnosis of complex system, and obtaining instructive application of diagnostic policy service. The testability design adopts the modeling technology of multi-signal flow, and establishes the testability model of airborne audio equipment of a certain flight in a hierarchical way. By analyzing and inducing the failure modes and effects, collecting the failure mode samples as the FMEA analysis report, it establishes quantitative testability model with the help of computer modeling and simulation tool, and obtains its rates of failure detection and isolation and relative failure diagnosis process through modeling and simulation. The weak link of this testability model is discovered through comparative analysis of testability indicators and testability experimental verification. The testability indicators of the equipment are improved significantly with model iteration and improved testability plan to meet the needs of application of the equipment.