一般專案管理著重於時程規劃及進度控管，實獲值管理方法不僅提供了成本、時程變異和執行指標的計算，並可預測專案完成的成本及時程。 本研究在於探討不良品質專案管理實獲值模式之發展，以獲得品質投資對不良率之影響。運用實獲值管理中成本及時程的相關基本指標，並依據Anbari(2003).期刊的參考數據，嘗試加入專案第一階段不良率q1和第二階段不良率q2，發展不良品質之實獲值之間的模式與其效應，進而找到各階段最適品質水準，使總實際成本最小，以獲得專案成本效益。 General project management focuses on time planning and progress schedule control, earned value management approach, which not only provides a cost and time variation and performance indicators, and can also predict the cost and schedule to complete the project. This study is to investigate project management with defects for the develop-ment of earned value model to obtain the impact of the investment on the quality. Basic indicators related to the use of earned value management can be with respect to cost and schedule. According to the reference data from Anbari (2003), the first stage and the second stage of the project are corresponding to the defective rate q1 and q2, for the development of the earned value of poor quality in the model and their effects. The optimal quality level of each stage can be obtained to minimize the total actual cost and attain the cost/benefit of the project.