In order to make on-orbit maintenance easy, a division method for the orbital replaceable unit (ORU) of manned spacecraft is proposed. Selection range of ORU was determined based on analyzing on-orbit repair requirements of system. Then a logic judgment strategy for ORU division was established to obtain a preliminary partition scheme, and the verification method is used to adjust the scheme of ORU division. Finally, the proposed method is applied on a subsystem of a manned spacecraft and the partition scheme can ensure the balance of system performances, which indicate that the proposed method can provide a feasible approach to engineering implementation.
