Abstract: In light of the engineering characteristics of a new running tunnel approaching an existing subway station and in order to verify the feasibility of the design scheme to ensure safe and normal operation of the existing station, different construction methods with various scopes of stratum reinforcement were simulated by the FLAC3D Lagrange difference method, in which the rail settlement and structure stress of the existing station, as well as the law of surrounding rock deformation and the applied structural force of the new running tunnel, are analyzed. The analysis results show that the CRD method is recommended with the premise of grouting reinforcement in the interbed stratum, working face, and the left and right sides of the running tunnel within 3.0 m.