In the military theme of the film, television works, we often see commanders standing in front of a terrain model to study the combat plan. This according to topographic maps, aerial images or field terrain, according to a certain proportion relationship, with sand, chess and other materials piled up model is sand table model[1]. Sand table model is divided into simple sand table model and permanent sand table model. Simple sand table model is with sand and chess on the field of temporary piling system; permanent sand table model is with foam board (or plywood), gypsum powder, papier-maché and other materials, can be stored for a long time. Sand table model has a strong sense of three-dimensional, image intuitive, easy to produce, economical and practical features. The sand table model has a wide range of uses, which can show the terrain of the combat area, indicate the composition of the enemy and our positions, the deployment of troops and weapons configuration and so on. Military commanders commonly used to study the terrain, enemy conditions, combat programs, organization of coordinated action, the implementation of tactical exercises, research cases and sum up combat experience. Sand table model is also commonly used to produce economic development planning and large-scale engineering construction model, its image is intuitive, quite popular with plan decision-makers and engineers and technicians favor.
In terms of psychotherapy and testing, sand table model is widely used to find and solve psychological problems, under the guidance of a psychiatrist, the person to be treated or tested with their own wishes to set up a sand table model of the scenario, by the psychiatrist according to the patient to pose the plot or look to determine certain psychological aspects.