For the underpass railway large-section box culvert jacking and pipe jacking project, the key to ensuring the normal operation of the existing railway is to maintain the smoothness and stability of the track, railway settlement monitoring and line reinforcement, and box culvert and pipe culvert attitude control are the keys to solving this problem. Taking the Beijing-Harbin high-speed railway project under a city road in Beijing as an example, the law of railway track settlement during the implementation of box culvert jacking was analyzed according to real-time monitoring data. The monitoring results show that accelerating the pouring of the bedding and grouting and strengthening the railway subgrade on both sides of the foundation pit can effectively control the settlement of the railway subgrade and reduce the impact of subsequent construction on the railway, and the line renovation and secondary grouting reinforcement can effectively improve the smoothness of the railway. Combined with the comparative analysis of numerical simulation results, the necessity of line refurbishment and rail fastening combination reinforcement in actual construction is verified.With the advancement of railway and high-speed rail construction, later highways often need to cross existing cable railways, resulting in many level crossings between the two [1]. Proper selection of the intersection form of highway and railway intersection is very important for traffic safety and smoothness, and the jack-frame bridge has gradually been popularized and applied due to its advantages of low cost and low environmental impact on the surrounding environment. [2] During the construction of frame bridge jacking, each key stage of construction (such as excavation of work pits, line reinforcement, bridge body jacking, etc.) will affect the track smoothness of the operating railway. How to reduce the traffic interference to existing wires, make the frame bridge quickly and accurately in place without affecting the normal operation of the railway, and how to limit the displacement of railway subgrade and track during construction and ensure soil stability are the key issues and core objectives in construction control. [3]