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The safe flight of both backup spacecraft and primary spacecraft without changing the facilities onboard is discussed based on the design and operation of Lunar Exploration Spacecraft. Since the backup spacecraft is the backup spacecraft of the main spacecraft, the two satellites are designed and produced at the same time with the same hardware and software, and they fly at the same time around the similar place. By using the different tele command data rate, the different frequency, the shelter from the moon as well as the limit of the uplink power, the interference between the two tele command link is avoided, and the safety of the two satellites are maintained.