Abstract: Based on the measured data of support axial force and support structure deformation caused by the foundation pit excavation at rail transit Haiyanbeilu Station in Ningbo City, the deformation control effects of hydraulic servo steel support and ordinary steel support are comparatively analyzed. Research results show that the deformation of the surrounding structure and the ground surface settlement in servo steel support section are reduced by 16%~20%, and 13%~25% respectively compared to the ordinary steel support section, in which the loss of axial force is obvious. While the hydraulic servo steel support can effectively make up for axial force loss of the ordinary steel support, reduce the deformation of the support structure and improve the security of foundation pit excavation by adopting the “low compensation and high adjusting”, working mode.