Abstract: With the development of technology and social progress, the buckle type steel pipe support, as a structural support system, plays an increasingly important role in ensuring construction safety and quality. However, during the construction of the entrance and exit structures of traditional subway stations, the supports must be removed before the roof can be constructed, which inevitably involves the process of replacing the supports. If the conventional design scheme of replacing steel pipe supports with a diameter of 609 mm is adopted, it will be inconvenient for on-site construction, installation, and dismantling operations. Especially after the completion of the roof construction, there is a high risk of manual dismantling of steel pipe supports without mechanical lifting conditions, which can easily cause biological strikes and pose a risk of personal injury. This article takes the Shiqi South Station project of Guangzhou Urban Rail Transit Line 3 East Extension as an example. By analyzing the conventional practices at home and abroad, the replacement support technology is optimized: in the construction of the top pipe starting well structure at the C and D entrances and exits, the steel pipe replacement support is optimized into a fully supported combination of plate buckle brackets to replace the traditional plate buckle steel pipe support method. The practical results show that when using this technology for construction, the maximum deformation value of the foundation pit is 23.57 mm, the maximum deformation value of the top area is about 9.38 mm, and the maximum axial force value of the top steel pipe is 108.46 kN. All indicators meet the requirements of the specifications. The combination of buckle type full hall bracket and top support system was analyzed using modern finite element software, combined with rich construction experience and dynamic guidance of the construction process through construction monitoring information technology, successfully completing the structural construction task. The actual application effect shows that this technology has good economic and technical indicators, and can provide useful reference experience for similar projects in the future.