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As an effective means for improving system condition and reducing failures,a reasonable preventive maintenance scheduling guarantees the stability and safety of the system.This paper studies a consecutive maintenance scheduling problem for single-component systems with imperfect maintenance,and an optimum model with minimum reliability constraint for minimal cost rate is developed based on the renewal theory.The agebased and reliability-based maintenance strategies are modeled and compared according to a numerical example based on the degradation data of the actual system,which also verifies the optimality of the reliability-based strategy.At last,the influence of some key parameters is discussed by sensitive analysis.