Abstract: In recent years, the large-section rectangular top-tube technology has attracted considerable attention in urban underground engineering construction due to its significant advantages over traditional round top-tubes.This study aims to explore the challenges faced by the construction of large-section rectangular top-tubes in the A and B entrances and exits of Panyu Passenger Station in the eastern extension of Guangzhou Metro Line 3 under complex conditions such as shallow cover, poor geological conditions, and small pipe spacing, and propose targeted construction techniques.By comprehensively considering the actual engineering conditions, this study effectively ensured the progress of the project and controlled surface subsidence.This paper quantitatively analyzed the impact of construction techniques on surface subsidence, and the results showed that the use of targeted construction techniques could control surface subsidence to within 0.5 millimeters per square meter.By applying advanced measurement techniques, we conducted real-time monitoring of surface subsidence during the construction process and strictly controlled and managed it according to pre-set thresholds, ensuring that surface subsidence was controlled within a safe range.Moreover, we also employed optimized soil reinforcement methods, effectively reducing the impact of surface subsidence on the surrounding environment.The achievements of this study provide valuable practical experience and technical references for similar projects, which will help promote the further development of related research and engineering applications and provide important guidance and reference for urban underground engineering construction.