This paper introduces the geological conditions, supporting form and construction process of the engineering site of the support structure engineering for super-deep foundation pit of North Anchorage in Wuhan Yangsigang Yangzi River Bridge. The calculation model is established by using the 3D finite element analysis software, MIDAS GTS NX, with the interaction forces of soil and support structures considered. The numerical simulation of the excavation and support of the soil is carried out. Combined with the monitoring data of the field, the degeneration characteristics and the stress characteristics of the supporting structure in different excavation stages are obtained. The results show that the calculation results are in good agreement with the variation trend of the field monitoring data in the process of deep foundation pit construction, and that extra attentions should be paid on the control of the excessive deformation of the ground caused by excavation and the internal force of the supporting structure.