依据生态学和应用生态学的基本概念和原理，结合工程项目系统的特征，提出了工程项目生态系统的概念。采用对比分析法对工程项目生态系统的层次结构、原则、组成进行了具体的分析。工程项目生态系统的演化、平衡和生命系统一样，是个非线性的耗散结构,其演化和平衡满足逻辑斯谛模型。

The concept of construction project ecosystem was put forward conjoined with the characteristic of civil project system based on ecology and applied ecology. The hierarchy, principle and composition of it were specifically analyzed by contrastive method. It is a nonlinear dissipative structure, the same as life system in respect of evolvement and balance. The Logistic model meets the condition of construction project system development.