Abstract: In order to ensure the operational safety of rail transit, the research investigated the impact on the pile foundation of subway viaducts caused by the long and closely parallel pipe-jacking tunnels construction. Based on a pipe-jacking tunnel of certain power channel, the deformation law of pile foundations in various directions of pile foundation of subway viaducts during the construction process of pipe-jacking tunnel were analyzed by three-dimensional finite element numerical simulation analysis method. The results showed that: ① When a pipe-jacking tunnel passed through an existing elevated bridge in parallel over a long distance, it mainly affected the excavation face and the pile foundation before it, and when the excavation face reached a certain distance from the existing elevated pile foundation, the deformation of the pile foundation tended to stabilize. ② The deformation in the direction of vertical pipe-jacking of pile foundations was the most affected by the long-distance pipe jacking tunnel construction, with the maximum and average values reaching 2.27 mm and 1.04 mm, respectively. ③ The impact patterns of pipe-jacking tunnels on the pile foundations of elevated sections and elevated stations were basically consistent. However, the construction of the pipe-jacking tunnels had a greater impact on the pile foundations of the elevated section, compare to the pile foundations of elevated station.