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Testability modeling and analysis based on the multi-signal model provides a new way for testability design, however, testability information needed in the process of testability modeling can’t be obtained correctly and completely, which blocks the process of testability modeling seriously, points out that eliminating the obstacle between the product designer and modeling designer is critical for obtaining the testability information correctly. Analysis eight elements of multi-signal model, provides a new way for obtaining testability information and the engineering operation flow based on engineering practice,the flow includes 4 proceeds:identify the hierarchical structure, failure mode and effects analysis, signal-flow analysis, test analysis. Take a line replaceable unit as example, the testability modeling and analysis work finished, the result shows that the way obtaining the testability information and the engineering operation flow is feasible and effective. The result of testability modeling and analysis can estimate correctly whether the testability design is satisfied with the target in the design phase, and points out the direction for improvement. 