In order to reduce the construction impact of the new construction project of the North Transverse Channel passing under the section tunnel of the operational metro Line 10, and to ensure the safety of the metro structure and normal operation during the crossing, through numerical simulation calculation and combined with the construction experience of similar crossing projects, this article determines that the structural deformation control standard of the metro section tunnel is ±20mm . The underpass range during the crossing process is divided into the simulation section, crossing Zone One, crossing zone Two and crossing zone three, and the control points are respectively proposed; Set the parameters of shield cutting pressure, advancement speed, slurry retention, deviation correction requirements, segment assembly and synchronous grouting during the underpass construction; The deformation control of the operational metro section tunnels is further strengthened by adopting secondary grouting and information-based construction. After the crossing was completed, the actual construction parameters and settlement deformation data during the crossing were statistically analyzed. The research shows that the 20mm deformation control standard can meet the safety requirements of underpass construction and metro operation, and the efficiency of pressure injection of mud effectively controls settlement. In addition, when the pressure at the center of the shield cut is too high, it will cause the metro tunnel to bulge. The setting of the slurry pressure at the shield cut should be considered comprehensively in combination with the tunnel grouting and post-construction settlement.