As for a shield tunnel crossing beneath the railway tracks at Chengdu South Railway Station on Chengdu Metro Line 1, the finite elements theory is adopted. This thesis analyzes the risk factors of shield machine crossing beneath the railway tracks and puts forward technology to control settlement: with the predominance of track reinforcement, the boring parameters of the shield machine should be strictly controlled and monitoring management and information management should be strengthened. The tunneling should be carried out in strict conformity with the plan to ensure the safe and successful boring of the shield machine.