The monitoring is often suggested as a method to decrease the required safety coefficients in the design stage of a construction. The geodetic method is used for determination of horizontal and vertical displacement of excavation wall in this paper. The first we designed a geodetic network around of excavation region then we would verify stability of network points in any epoch of observation by bench marks that locate in far off from this network. When it turned out that network points are fixed, then we would measure distances and angles observations of target points that setting up over excavation wall, in several epoch time. The horizontal and vertical displacements are obtained by adjusted coordinates in two epochs. They will detect when the size of displacements vectors should be longer than size of theirs errors ellipses.

In twin towers project of Telecommunication Company of Iran, we verified displacements of an excavation wall that its depth is 20 meters. Its monitoring network has 7 points include 2 bench marks. The distances and angles observations are read for 4 monthly epochs from September to November, 2014. The displacements are showed by contour maps and table for any epoch. In results, it is obtained that the displacements change by linear function in soil depth domain and type of soil.