Abstract：
In order to solve the problems, especially the large engineering project budget inaccuracy problem, this paper puts forward the bidding system based on BIM. First of all, the business process of bidding system based on BIM and project budget are analyzed, and then its system architecture is designed. The system can effectively solve the major problems in the process of project bidding, and improve the accuracy of engineering budget. This system will better to make decisions and informatization construction.
