Abstract: The application of CFG pile composite foundation in high-rise buildings can greatly increase the bearing capacity of the foundation and effectively control the settlement and deformation of the building. At the same time, it has good economic benefits. With the development of social economy and the accelerating process of urbanization today, land resources are becoming more precious. With the gradual development of high-rise and large-scale building design, it is of great significance to carry out research on CFG pile composite foundation. Based on this, based on a comprehensive understanding of the CFG pile composite foundation reinforcement mechanism, combined with specific cases, this article analyzes the key points of the construction technology of the high-rise building CFG pile composite foundation, and on this basis, the integrity of the CFG pile is tested through tests. In order to effectively improve the construction quality of high-rise buildings.