Abstract:Now it is becoming more and more important to understand the project organization and project activities from the network perspective, just as the quantitative research methods on the relationship and integrating the formal relationship with informal relationship. This paper introduced the concept of project network to explain what the characteristic of project organization is and how to understand the project activities from the network perspective. The concept of project networks is grounded in a number of research literatures, including research on project teams, social networks and boundary spanning. Based on the previous research, the theoretical framework was established, mainly including the theoretical basis, research methods and research themes. The current research themes were classified into two parts: the project network ontology and the mechanism of action of project network. Finally, the paper put forward the future study of project networks.