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针对民机隐性功能系统维修间隔优化的问题，提出一种成本率（ CRF）函数，并以民机系统故障趋势的威布尔分布为基础，研究和建立民机系统“翻修期”区间内的预防性维修策略的优化模型和求解方法，最终实现优化民机系统隐性故障（非安全类）维修间隔的目标。最后，以B737民机液压系统回油滤组件弹出指示器可靠性数据为实例对模型和求解方法进行应用研究，证明了该优化模型和求解方法的有效性和适用性。“,”This paper comes up with a cost rate function( CRF)aimed at the problem of hidden function system maintenance interval optimization of civil aircraft,and studs to propose the optimal preventive maintenance policy model and solution in“Overhaul period”based on Weibull distribution,which finally achieves the best optimiza-tion objectives of the maintenance task intervals of hidden failures( non-safety effects)of civil aircraft system. Fi-nally,the paper delivers the practical research by the reliability data of filter indicator pops of hydraulic system on B737,and proves the effectiveness and applicability of the optimization model and solution.