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In view of the numerous launch vehicle systems, complex functions and various faults, this paper studies a fault diagnosis method based on MIL-STD-1553B data bus. By using the fault tree analysis method, the failure chain is determined, the fault of the launch vehicle is detected and located. In order to get more fault data, a fault injection method based on 1553B data bus is designed to inject specific faults into the launch vehicle. In the launch vehicle fault diagnosis and injection system, the fault diagnosis system acts as a bus monitor (BM), and the fault injection system acts as a remote terminal (RT). They are connected to the field bus 1553B, which connects the subsystem of the launch vehicle and the launch control platform outside the vehicle through the bus coupler. The project developed a fault diagnosis platform and fault injection platform and achieved satisfactory results in practical tests.