Abstract: Extending a conventional DTCTP (discrete time-cost trade-off problem) model by introducing the constraint on renewable resources, a new multi-mode resource-constrained DTCTP or MRC-DTCTP model is presented, where the renewable resources are corresponding to project costs by presetting proper resource price and all activities can be executed in a crash mode so as to shorten the time limit originally planned for the project. A branch and bound (B&B) algorithm for solving MRC-DTCTP model is developed and applied to computing the deadline for the project. According to the computation results, an entire time-cost trade-off curve is plotted and the advantages of the MRC-DTCTP model are discussed.