Summary: Preventive maintenance plays an important role on the operational reliability improvement. The maintenance effect and finite planning horizon are introduced into the basal periodic and sequential preventive maintenance policies simultaneously. When configuring maintenance optimization, the impact of the alternation between downtime and uptime on failure intensity is considered. The failure process is regarded as a failure-counting process, and then the maintenance effect assessment model based on cumulative-failure-counting is proposed. In addition, the preventive maintenance cost is developed to consider the maintenance effect as a function of allocated maintenance cost. Numerical examples show that the proposed method can reduce the maintenance cost rate and improve the operational reliability.