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When the aircraft and the booster rocket simultaneously perform fairing throw and separation stage at low altitude and high speed, high dynamic pressure results in short establishment time of interference flow field, large aerodynamic force interference and rapid change of aircraft attitude angle, as a result, the time for the aircraft to maintain attitude stable and controllable after separation with the rocket is only tens of milliseconds, the rocket needs to send high-precision time synchronization instructions to the aircraft at the time of stage separation to ensure that the aircraft can start control within a controllable time; Based on asynchronous RS-422 communication time series instruction and separation connector break-wire switch time series instruction, design a redundant stage separation time synchronization scheme, and add error correction mark to 422 time system instruction to solve the problem of time synchronization accuracy reduction cause by communication error or frame loss, compare with the conventional travel switch or break-wire switch time system device, it has higher time synchronization accuracy, stronger fault tolerance and testability; Through ground test and flight test verify that the time series scheme meets the accuracy requirements of time synchronization.