Project's duration - expense exchange question focus on how to optimize the goals by least expenses or by shortest duration limit for a project, and did not consider the influence of such optimization and incentive mechanisms for receipts and quality. This article first proposed the theory of generalized cost, brings the duration, the cost and the quality into line with the cost category, and
... [Show full abstract] constructed integrated optimization model of Duration, cost and quality based on the theory, with practical examples, the theory is proved feasibility, scientific and economic.