This paper commenced on micro-level of construction projects, researched the contributing capacity of economic development, social equity and the protection of environment, and built the evaluating indicator system of comprehensive contributing capacity of construction project, then analyzed the purpose of constructing this evaluating indicator system, and the way of acquiring every index. After that, this paper built an entropy evaluating model to comprehensively evaluate the comprehensive contributing capacity of the construction projects. Finally the model took Chengdu-Chongqing highway as a case study.