Abstract: Change of ground water level gives rise to ground deformation is concerned in this paper. It describes several actual experiments in-situ of pumping water from wells, indicating the relation between the variation of elevation and the pumping, with respect to time and location. Around the pumping wells and within the limit of a funnel-shaped ground water surface, not only vertical movement, but also horizontal compression and dilatation can be observed. A preliminary discussion has been made in connection with the distinction between ground deformation caused by ground water change and other factors.