Abstract: Objective: It is aimed to investigate the influence of largeprofile flattop straightwall PBA (pilebeamarch) undergroundexcavated (hereinafter referred to as ′covered′) metro station underpassing construction on the existing tunnel at zerodistance. Taking the above station excavation project as example, the construction of PBA covered station project is designed. Method: Finite element analysis software is used to simulate and analyze the construction process of PBA covered station zerodistance underpassing interval, the construction monitored data and the simulation results are fitted and compared, the law of land subsidence, structural settlement and lateral (zaxis) displacement of existing tunnel throughout the construction process is summarized. Result & Conclusion: The construction monitored data and simulation results are consistent in terms of value and development trends, verifying the accuracy of the simulation analysis. The land subsidence gradually increases with the excavation steps. The maximum settlement increment occurs from step 1 to step 2, while the minimum occurs from step 6 to step 7, and the settlement increments gradually decrease from east to west. The settlement near the east side deformation joint is the largest at each construction step. After completion of the underpassing section construction, the monitored data shows that the maximum settlement of the existing tunnel structure is 6.91 mm, which occurs near the deformation joint 1 in section b of the existing tunnel, and the settlement of section b is the largest, followed by section a, and section c has the smallest settlement. After completion of the underpassing section construction, the monitored data shows that the maximum zaxis displacement of the existing tunnel structure is only 0.19 mm, which occurs in section c. The zaxis displacement of section a and section b is relatively little and the change is not evident. The deformation of the existing tunnel structure is mainly settlement, so the zaxis displacement can be ignored.