Research conclusions: From the research on the actual terrain condition and the 3D FEM model for the design of the tunnel lining, it was seen the maximum additional displacement of the railway tunnel was about lmm, the maximum additional stress of the tunnel was 1810 kN*m/m and the maximum horizontal displacement of the highway excavation face was about 41.0mm. On the premise of well doing the works of construction organization and monitoring, the safe operation of the railway could be archived. It was also proposed that the excavation could be symmetrically conducted section by section，zone by zone and layer by layer and the appropriate adjustments of the construction procedures could be made according to the monitoring data to further reduce adverse effect on the tunnel.