Aiming at the deterioration failure of the naval missile general automation test system, combined with the characteristics of the test system module and the non-repairable parts and spares, spares for a long time to prepare, based on the condition monitoring maintenance replacement and the spares ordering strategy. The maintenance strategy introduces performance reliability, determines the level of non-serviceable module degradation by condition monitoring and cycle check, and then makes module replacement decisions based on the module degradation level and determines whether to reserve spares and reduce downtime according to the number of spare parts in the inventory, To ensure the operational readiness, to achieve decision-making optimization. Theoretical analysis and case analysis show that compared with the original strategy, the proposed strategy can shorten the maintenance cycle, improve the operational availability, to ensure the continuous and safe operation of the system.