Study on the Impact of PMO for Multi-Project Management of Contracting Construction Enterprises — Based on Structural Equation Model

13 key factors, which affected the ability of Project Management Office (PMO) and multi-project management, were extracted through literature reading and expert interviewing. Based on three aspects of assumptions, Structural Equation Model was used to build the structure model that PMO influence on multi-project management of contracting construction enterprises. The relationship among PMO, Program and Project Portfolio were analyzed on the basis of questionnaire survey on the 238 the national excellent project manager and high-level business executives. The results show that the most important function of the PMO is coordination management, the second is the risk forecasting and management, the third is information processing and finally is resource allocation. Consequently, the PMO can support the multi-project management, the Influence degree of PMO for project portfolio is the largest, followed by the program management, and single project management is the third one. With the increasing of project amount, difficulty and complexity, and the role of PMO is more significant.