This project falls within the interdisciplinary field of architectural technology and computer simulation. Through a method for drawing three-dimensional dynamic scenes of urban building complexes based on the BRLO-Tree tree structure, an innovative approach is formed to create a three-dimensional GIS dynamic integrated spatial scene for the building complex, providing a scientific basis for the spatial structural distribution and energy-saving environmental optimization design of the building complex. Currently, there are bottlenecks in domestic and international research hotspots in computer digital simulation, such as long simulation times and high complexity. By developing interactive scenario technologies for 3D GIS building complexes, a three-dimensional model that changes dynamically with time is created; at the same time, this data structure can make the environmental images smooth, reducing the loading time and average drawing time of the model, thereby providing precise data support for the energy-saving of the three-dimensional dynamic environment of the building complex. This research work has also undertaken multiple projects in Shanghai and other places. And has been effectively applied in multiple practical projects. The main innovative achievements of the project are as follows: (1) In response to the problem that the drawing time and loading time for urban building complex three-dimensional dynamic scenes were too long, an BRLO-Tree tree structure algorithm was invented. (2) To address the blank space generated when the viewpoint suddenly changes during model loading, a method for drawing urban building complex three-dimensional dynamic scenes was proposed, solving the issue of blank spaces at the load point of environmental models. (3) Based on GIS technology, by constructing the BRLO-Tree tree structure algorithm, a new interactive theoretical foundation for the dynamic energy-saving design of building complexes was formed. (4) Based on computer multi-threading technology, combining dynamic modeling simulation technology with architectural design solved the difficult problem of dynamic energy saving simulation in architectural design, which has been applied in practice and produced good economic benefits. (5) The key and difficult issues of long duration and high complexity in architectural digital simulation methods have been resolved, and the method has been effectively verified in actual building complex energy-saving design projects. As a basic theoretical research project, it has achieved excellent research results. More than twenty papers with SCI, EI, etc., have been published in domestic and international important journals. It has trained numerous master's and doctoral students, published monographs, and obtained national invention patents. The project achievements have received unanimous praise from many renowned experts at home and abroad. The project outcomes have also been applied in practice, and the technical theories and methods derived have been used in projects such as the comprehensive mechanical and electrical system of CITIC Taifu Wanda Plaza, the office building of Meituan Dianping Shanghai headquarters, and the standard factory buildings and bonded zone factories in Qingping, Zunyi, Guizhou. By integrating dynamic scene combination methods with architectural design, the project has reduced building energy consumption. It has brought an additional output value exceeding 400 million yuan, reaching 400.3 million yuan; The additional profit reached 84.83 million yuan; the additional tax revenue was 38.27 million yuan; and the total savings amounted to 65.97 million yuan. With its continued promotion and application, it will generate greater economic and social benefits.