This paper mainly introduces the BIM technology application of the outer curtain wall project of the CBD Tower in the new capital of Egypt, during all different stages of preliminary design, scheme optimization design, factory processing, and construction site management. For the curtain wall design of this project, the BIM technology is adopted from the early stage of scheme design and system design, aiming at solving the problems that may be encountered in the construction in advance in the early stage of project design. In the process of scheme optimization design, considering that the most area of curtain wall in the project is designed in hyperboloid shape, the Grasshopper1.0, a visual programming plug-in of Rhino6.0, is applied to analyze the curvature of curtain wall panel and carry out panel optimization. Part of hyperbolic curtain wall panels are optimized to be flat unit curtain wall, providing convenience for following construction. The application of BIM Technology in the deepening design, material cutting and construction of hyperboloid structure is also analyzed. Additionally, the application of BIM technology also contributes to solving the problems of difficulties in curtain wall detailed design, high processing accuracy requirements, troublesome construction and installation management, and obstacles in operation and maintenance, finally realizing the intelligent construction of curtain wall project.