Collaborative design is the management support of BIM-based engineering design. With the purpose of solving the problem of model management in collaborative design, we make comprehensive application of BIM model management, user management, conflict resolution, the incremental model of transmission, user communication and etc. The research shows that using the integrated management of BIM model, we can build up a web-based collaborative design environment, which can improve the engineering design quality and efficiency significantly. The BIM management mechanism in collaborative design can provide reference for domestic platform development of collaborative design management.