In the construction of “digital city”, the corresponding “digital planning” proposed by the urban planning technology business is matched with it; in the construction of “smart city”, corresponding “smart planning” solutions are also required to match it. The purpose of this paper is to study smart urban and rural spatial planning methods based on the era of big data. The demand for smart urban and rural spatial planning and the method of land use layout are studied. Based on mobile GIS, ArcGIS Server, mobile network communication, spatial database and other technical means, a set of smart urban and rural spatial planning system is designed and developed to solve the problem that planning data is difficult to manage uniformly and change data. Difficulty with automatic updates. Taking the site planning project in Shibei District of M City as an example, the current situation of the site planning project is analyzed through the system function, and the operation efficiency of the planners is improved.