The integration of BIM and GIS has received extensive attention and research at home and abroad, and its application fields are also very broad. This article starts with the characteristics of BIM and GIS data, analyzes and discusses the fusion method and application development. The data standards used by BIM and GIS are different, resulting in different fusion methods, and further the problem of information loss after fusion. At present, the application of the integration of BIM and GIS has achieved initial results. It is relatively extensive in planning and design, project management, and is in the initial and exploratory stage in smart cities and municipal management. In general, the integration of BIM and GIS has a lot of room for development in theoretical research and integrated applications.