The reconstruction and recovery strategies aiming at the control units of the triple-redundancy flight control computer are studied. The redundancy architecture of the flight control computer is briefly introduced. The reconstruction strategy of the control unit is designed by combining self-detection with mutual detection. And then, the recovery strategy of the control unit is designed by reasonably screening the recovery data and formulating the recovery protocol. Finally, a semi-physical simulation platform is built to verify the validity and correctness of the reconstruction and recovery strategies, which improves the reliability of the triple-redundancy flight control computer.