关键词: 项目管理, 复杂网络, 项目组合, 项目群.

Abstract: The paper introduced complex network theories into project portfolio management, take projects as nodes, the relationships among the projects as edges, and the cost as node weight, the tightness of the projects as edge weight, The poject portfolio is then generalized as a weighted complex network. The papers studied project portfolio network of four enterprises, and sumerized the behavior characteristics on the basis of analysing the project portfolio. Through comparative analysis, the paper discovered these similarity characteristics: ①Degree distribution of the node differs from that of other society networks, it tends to be power-law, while also seems to follow skewed poisson distribution; ②Relative coefficient of the degree is negetive, which also differs from other society networks; Project portfolio enjoys cluster structure; ④Accumulation coefficient is large; ⑤Network diameter is small; ⑥the average degree is less than four.

Key words: project management, complex network, project portfolio, project cluster.