The purpose is to make the whole desktop model dynamic and energetic, and give visitors a very novel feeling. To achieve the purpose: it is composed of a sand table frame, a display model and a lifting device. The lifting device is installed in the display model, and the display model is set in the sand table frame; the display model is parallel to the scale model surface when it is not lifted; there is a central hole in the display model; The display model is composed of screw rod, pressure plate, screw, nut.