Abstract: In the deep foundation excavation process,, the undisturbed structure will produce the horizontal displacement for the pit due to lateral soil pressure, when the undisturbed horizontal displacement is too large, the whole supporting system will be instability or destruction, so the deep horizontal displacement testing of the deep foundation pit structure is particularly important. In this paper, it is analyzed that the horizontal displacement testing results of a deep foundation in shanghai, which include the displacement rate, the time effect of different excavation conditions, the different displacement reasons in the undisturbed edges and the comparison between the maximum displacement in end monitoring and the calculated displacement values, and in the end, it is proposed that some relevant measures to control this deformation.