某些商品的失效與衰退是同時受到二種因素所影響，當制定此類商品之保固政策時，便須以雙構面保固模式來作為合理的衡量構面；此外，為了維持商品品質及可靠度，預防性維修的觀念也逐漸被買賣雙方所重視，但以往文獻中，卻缺乏結合預防性維修與雙構面保固模式之研究，因此本研究以雙構面保固模式為基礎，融入預防性維修之概念，透過利潤最大化方法，制定廠商利潤最大化之最適保固政策，並以數值驗證與敏感度分析探討模式之可行性。此模式之應用乃針對附帶預防性維修選擇之商品，依據消費者是否願意在保固期間支付預防性維修成本，提供二種保固選擇方案，並分別為二種方案訂定利潤最大之最適之保固期限。若消費者不願於保固期內負擔預防性維修成本，廠商將提供一般性之保固政策；反之，若消費者願意於保固期內支付預防性維修成本，廠商將會提供較寬裕的保固政策。由於二種方案之保固政策，均為廠商利潤最大化下之最適保固期限，且經由模式之解說，能夠提供適合消費者本身預算與偏好的保固方案，因此既是消費者權益的保障，同時也是廠商提高利潤的行銷手法。

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