Abstract: A lot of engineering practice indicates when the dynamic compaction is used to reinforce founation of fill, the selection of tamping energy is not only related to the thickness of fill, but also to the conditions of soil and groundwater table, etc. In this paper, a discussion is made on the use of tamping energy to reinforce the foundation with large fill thickness in southern China. If the substratum of the fill is either hard or soft, and if the filling material is coarse aggregate and fine aggregate that is cohesive soil with high water content, respectively. The selected standard of tamping energy is established in different conditions. From the data of field monitoring, an evaluation is made of the effectiveness of foundation reinforcement by adequately determining the tamping energy, so that the better consolidation effects could be achieved.