With the rapid development of BIM in China, the application of BIM in the field of architecture is more and more important, and it comes to affect working methods of construction workers, especially the analysis on green energy-saving. The traditional work method is to build models in different green analysis software based on different analysis contents, which is not only time-consuming but also difficult to guarantee the consistency of the models. At present, we can use BIM technology to achieve docking technology between BIM and green analysis software, which can improve the work quality and efficiency. With the Chengchuang Building located in Nanhai District Foshan City as an example, this article puts forward the idea of BIM-based green energy analysis and introduces in detail some key issues like model simplification, format conversion and analysis method according to different analysis content and green model analysis software. The practice results show that the analysis of green energy based on BIM can to a certain extent reduce duplication of modeling workload, guarantee the consistency analysis model and design model, and provide a new technical way for the green energy saving analysis.