Abstract: In order to promote the development of energy-saving construction industry in our country and solve the current situation of large amount of energy consumption of public building, the current situation of BIM technology application has been reviewed.Based on the application of BIM technology, to analyze the separate energy consumption of the public buildings by the DeST software which is a kind of building thermal environment simulation tools.Then, statistical results could be produced, those are for the thermal performance, lighting system and air conditioning system, which can point out the direction of designing the energy consumption monitoring system.Based on the analysis of statistical results, it could be concluded that the overall energy consumption of the building is enormous, which needs real-time monitoring.Accordingly, to design the basic functions and system architecture of the energy consumption monitoring system from three aspects.The design is aimed at building a reliable, efficient and sharing energy consumption database for the energy consumption monitoring system.To establish the platform of energy consumption monitoring, the statistics and the publicity could promote the application of BIM technology in the building energy-saving, which has some reference value to research.