Abstract: Through the analysis on monitoring data of the deep foundation pit for east-section of Qiutao Road station of Hangzhou Metro,such as horizontal displacement of retaining piles,axial force of steel struts,surface settlements and underground water levels,some valuable conclusions were drawn.It was shown that the deformation characteristics of the retaining structures were related to the horizontal displacement of the retaining piles which was an important criterion for the safety condition of retaining structures.The lateral deformation of the retaining piles was mainly induced by excavation,and was related to exposed time of wall face after excavation.The axial force of the steel struts increased with the increase of the excavation depth,and its value varied with the excavation modes and velocities,air temperatures and dismantlement of the underlying struts.The distributions of the surface settlements in the east of the foundation pit were a parabolic,while those in the south of the foundation pit were triangular.The variation of the underground water levels in the outside of the foundation pit could reflect the watertight effect of the retaining structures.