According to the characteristics and surrounding environment of a deep foundation pit with pile-anchor retaining structure, a corresponding monitoring program was developed. The monitoring project focused on the horizontal displacement of retaining pile top, the surface settlement around foundation pit and the original buildings displacement near the foundation pit．The results show that the maximum deformations occur in the middle position of each side and the corners of the foundation pit．The prestressed anchor effectively rejects the horizontal displacement and settlement of retaining structure. The displacements of buildings near the foundation pit are affected by the foundation pit excavation speed and the anchor bar setting time, etc. The displacements have obvious timeliness and spatial effects. The results provide a reliable basis for the safety construction and rational organization of construction.