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There are many deficiencies in testability test of complex systems, such as the external conditional existence of equipment failure can not be modeled , the equipment failure mode of external input and output is too simple for the testability test. As a new approach to the problem, the concept of exogenous fault is defined. The characteristics and basic requirements of exogenous faults are summarized. Then an exogenous fault injection approach based on the application data simulation of external bus is proposed. From the advanced application logic of the complex system, this approach establishes an automated real-time simulation fault injection environment, simulates the behavior of cross-linked environment by full digital simulation model, change the input, output, or parameters of the model, and implement the fault injection of the advanced behavior of the bus. At last, the implementation scheme of exogenous fault injection in the test is described, the key technology and environment construction of the method are analyzed, and the implementation process of external fault injection test is developed.