Abstract: Objective Shield tunneling method construction inevitably encounters conditions of over-passing existing underground pipelines. If not properly treated, this situation may pose risks such as pipeline damage and oil-gas leakage. Therefore, it is necessary to study the construction impact and control measures of shield tunneling over-passing underground pipelines. Method Taking the shield tunneling section of Qixia Mountain Depot access lines on Nanjing Metro Line 6 as the engineering background, and based on field monitoring data, the deformation characteristics of the pipeline and ground surface caused by twin shield tunnels over-passing an oil pipeline in silty clay strata are analyzed. Result ＆ Conclusion During the process of the shield machine over-passing the oil pipeline, the pipeline deformation exhibited a pattern of initial uplift, followed by falling back, and then a second uplift until final stabilization. Among them, the initial uplift is caused by soil unloading during tunnel excavation, while the subsequent subsidence is induced by synchronous grouting; the greater the grout volume, the greater the falling back amplitude. Land subsidence is influenced by stratum loss, while surface uplift is caused by high chamber pressure and grouting pressure. The pipeline and ground deformation response nodes at each construction stage exhibit approximate the maximum displacement values. Among these, the synchronous grouting at each construction stage has a more significant impact on pipeline deformation（with fluctuations reaching up to 20 mm）. During the twin shield tunneling over-passing, the maximum pipeline deformation is 16 mm and the maximum ground deformation is 10 mm-both within the controllable range of construction.