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What is the use of BIM? What is the use of BIM? What is the actual use of BIM? When someone asks you three questions about the benefits of BIM, you can give them the following examples: 1. Design optimization – The Liaoyang East Road vehicle depot on Qingdao Metro Line 2 utilized BIM technology; through model-based review of drawings, it was possible to identify conflicts and inconsistencies between different specialties such as architecture and structure, structure and structure, mechanical and electrical systems and structure, as well as between mechanical and electrical systems themselves. These issues could be addressed in advance, preventing the need for additional modifications or rework later on, and thus saving time. During the construction of the Gaojiaping Tunnel on the Zhengzhou-Wanzhou High-Speed Railway, a model was developed to describe the relationship between the rebar in the secondary lining of the tunnel and the lateral drainage pipes. Collisions between these elements were detected (indicating design flaws), and 5D technology was initially applied in the Gaojiaping Tunnel to improve management in terms of safety, quality, schedule, and coordination among various teams. During the drawing review phase, the Guangzhou Metro project team utilized BIM technology to overlay models from various specialties in order to carry out collision detection and identify issues such as overlaps, omissions, and deficiencies. This information was then provided to the designers promptly for scheme optimization, thereby reducing design changes and rework during the construction process. 2. Site layout: The Liaoyang East Road vehicle depot for the first phase of Qingdao Metro Line 2 uses a model created through BIM technology to simulate the construction layout, material storage areas, temporary structures on site, and transportation routes, thereby adjusting the placement of construction machinery such as tower cranes and construction elevators. During the construction of the Guangzhou Metro Knowledge City project, BIM technology was used to simulate the on-site conditions, enabling planning and management for safety and orderly construction at the site. The Shanghai Metro Line 17 project utilizes 3D scanning technology and BIM modeling to rapidly create models of the evacuation platforms, thereby enabling accurate measurement of the actual conditions and obtaining parameters for various components of these platforms such as supports and beams. At the same time, the building parameters output from the BIM model are used to fabricate prefabricated evacuation platform structures, which are then assembled on site. 3. Construction simulation: During the construction of the traction substation for the Huzhang Railway project, technicians used BIM technology to create a construction platform for simulating the construction process and optimizing the construction plans and sequences. By adopting this construction management method, the construction quality is ensured while the standards for construction techniques are improved. The Changsha-Zhuzhou-Xiangtan Four-Electricity Integration Project utilizes BIM models, allowing cables to be laid without the need for cable supports, thus eliminating the concern over support issues. Therefore, there is no need to worry about the layout of brackets in the design drawings, and thus there are no restrictions on the direction of cables or their installation sequence. The most rational cable routing design can be achieved. The Optics Valley Complex project makes full use of BIM technology and virtual construction to integrate spatial information with temporal information into a visual 4D model, thereby reflecting the construction procedures for various building components in a more intuitive and accurate manner. This approach helps to coordinate the concurrent construction activities of different specialties effectively, ensuring smooth progress of the project. By importing the construction schedule into Navisworks and entering the actual progress of construction, it is possible to conduct simulations of the planned progress, the actual progress, and a comparison between the two. Additionally, by including relevant project information, simulations related to personnel, materials, and machinery can also be carried out, which can effectively guide the actual construction process and **reduce costs associated with rework and management. 4. Visual instruction: During the construction of the Liaoyang East Road vehicle depot for the first phase of Qingdao Metro Line 2, it was necessary to provide the working teams with instructions on the construction process, techniques, and key points for quality control before starting each stage of work. In vehicle depot construction projects, BIM technology is used for 3D visualized instructions, which are not only intuitive but also improve the efficiency of providing such instructions. Pier No. 156 of the Xijiang Grand Bridge in the Nansha Port Railway project is an underwater pier, requiring complex construction processes and high standards for oversight. Therefore, using “BIM” technology to provide visual instructions to workers prior to construction helps them understand the construction tasks and procedures, thereby improving the quality of construction. The first-phase power supply project for Guangzhou Metro Line 13 utilized the visual capabilities of BIM models to provide explanations through simple 3D models. This approach meant that on-site construction no longer relied solely on 2D drawings, allowing for visual instructions to be given to the workers; it prevented rework due to misunderstandings and **improved work efficiency on site.**