In the era of knowledge economy, under the network environment project collaborative knowledge construction has been paid more and more attention. Project team knowledge transfer between form a knowledge network, in line with the basic core in complex network theory goal-directed (edge network structure), has its uniqueness. In this paper, this paper discusses the knowledge network formation, network evolution stage, according to the knowledge sharing, knowledge transfer, knowledge learning and knowledge creation of four phases of the micro mechanism of knowledge collaboration, and points out that the body of knowledge of the cooperative intention, attitude and sense of trust, the body of knowledge of the network structure, location and neighborhood structure, the overall network effect and the types of knowledge, is an important factor affecting the knowledge synergy. Discusses the co-evolution of knowledge network project in cooperation, use the interpretative structural model to construct collaborative knowledge construction process of analogy model.