In Complex Product Development (CPD) project, enterprises gather suppliers distributed in time, space under the thought of lean product development. However, increasing number of globally distributed project teams bring with great challenges for virtual projects to arrive at high levels of collaboration. This paper presents a Collaborative Project Management (CPM) framework that aims at improving suppliers’ integration in the process of project management by enhancing collaboration among a multi-tier supplier network. Related concepts, implementation steps and supporting tools in this framework are introduced. Finally, a prototype system was developed to provide enterprise an interface to collaborate with supplier network.