Fly-by-wire backup control system and starting method thereof

The invention discloses a fly-by-wire backup control system and a starting method thereof. The starting method comprises the steps that after power-on initialization and self-detection of a backup control computer are successful, the backup control computer enters a cold backup state, and the backup control computer receives a state signal of a main control channel; when the state signal of the main control channel indicates that the main control channel fails, the backup control computer enters a pre-position state, the backup control computer supplies power to the sensor module and the servo actuation module, and after communication is established between the backup control computer and the sensor module and between the backup control computer and the servo actuation module, the backup control computer enters a switch-on state, wherein the backup control computer generates a control command to control the servo actuation module based on a sensor signal received from the sensor module. 公开了一种电传飞行备份控制系统及其启动方法。