Abstract: The newly built Chengdu Metro Line 19 Tianfu Commercial District Station under-passes existing operating station at zero-distance safely, it adopts rectangular section design and mining method for construction. Based on analysis of construction key points and difficulties, construction schemes are compared, and the segmentation scheme has significant advantages, more adaptable to this project. By establishing stratum-station structure finite element model, the existing station force conditions during excavation construction phase and normal operation phase are simulated and calculated. Simulation calculation results show that segmentation construction can satisfy the control requirements of structure deformation, bearing force and cracks. The main protective construction control measures of the existing station are introduced briefly, and advanced equipment and technology are adopted to monitor the existing station deformation. Monitoring results show that existing operating station deformation is well controlled. Monitored items are all below the controlled value, and the overhead operating station is under safe and controllable state.