The digital sand table of urban planning is the product of the development of an era. It can show the culture, history and development achievements of a city in all aspects and from many angles, which is the spokesman of a city. Urban planning digital sand table is based on the traditional sand table, combined with audio-visual and three-dimensional animation and other multimedia technology to display, a change of the traditional sand table static single display mode, can be vivid and lifelike display in front of people.