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A testability modeling method based on the multi-signal flow graph model was proposed to deal with the fault diagnosis problems of the wind tunnel system. According to the system composition and the functional structure of devices, the wind tunnel is divided into different levels, and the FMEA results of devices in wind tunnel are obtained according to the failure cases in the actual operation. Then a multi-signal flow graph model of FD-12 wind tunnel was established, and the correlation matrix was constructed using the corresponding relationship between the failure mode and the measuring point. Finally, the TEAMS-RT algorithm was used to evaluate the testability level and fault diagnose capability of the established model. Results show that this method is effective for testability modeling and fault diagnosis of wind tunnel system.