The level of shared services and allocation optimization of spare parts plays a key role in equipment maintenance. Aiming at the shortcomings of existing spare parts management in terms of service capabilities and allocation optimization, the maintenance BOMbased spare parts sharing service method was proposed to achieve the improvement of spare parts utilization and accurate service capabilities when the spare parts inventory was determined.Meanwhile,a method for spare parts allocation optimization of a series system based on spare parts BOM was also presented,to find an optimal spare parts allocation plan under the constraints on system spare parts fill rate and guarantee task duration.Finally, the feasibility of the proposed method was verified by taking the spindle system of a CNC machine tool as example. The proposed method has certain reference significance to the promotion of spare parts service capabilities and the reduction of equipment maintenance costs.