BIM is difficult to be applied in the management of whole course.This paper has analyzed and has discussed its common causes, then has made further improvement and optimization based on IFC model server. The BIM engine that can be embedded in other management systems is built, and is combined with assembly construction management system and OA process management system in practice, to achieve the Modular Construction Information System based on BIM. It has addressed those common problems of BIM information system in a better way.