Abstract: In the process of rapid urbanization, construction land continues to devour high-quality land resources, resulting in deterioration of the ecological environment.In this paper, the mobile window method is used to obtain the construction land source, the economic and social factors are selected to build the resistance system, the MCR surface is generated, the natural breakpoint classification method is used to obtain the suitability partition, and the appropriate expansion path is obtained through the Hydrology expansion module in ArcGIS. The ecological isolation zone and ecological key points provide reference for the future urban construction land expansion direction and ecological construction.The results show that:①70% of the area in Nanchang belongs to the permitted construction area. For important areas that maintain the urban ecological environment, it is important to protect and take into account the common development of economy and ecology. ②Using the Hydrology expansion module to extract the features of the MCR surface in Nanchang city, it is found that the north and west of the main city are more suitable for construction land expansion. ③The key points of ecology play an important role in maintaining the urban ecological environment. In the future planning, key protection should be emphasized and development should be restricted.

Key words: construction land, moving window method, MCR model, suitability zoning, Nanchang city