Pumping test is carried out in the silty soil interlayer in the third hard soil layer in Shanghai, that is, 10th layer of confined aquifer. The water level, surface settlement and deep layer settlement are observed. 3-dimensional seepage and Biots consolidation theory simulation are used to analyze the relationship between the vertical deformation of the stratum and the change of the groundwater table during the deep confined water pumping process, which provide the basis for groundwater control in ultra deep foundation pit.