Overall changes in farmland to some extent mark the developing rules of regional social economy, human activities and urban changes, of significance to research urban developing process. This paper, in terms of Xi'ning's land use survey data 2009 to 2016, uses spatial vector data of dry land and watering land by processed by Arcgis to analyze its farmland dynamics, changes and core shift, and discusses the actual land overall changes and spatial distribution of three counties and four districts in Xi'ning in recent years, revealing an inner relation between urban development and farmland changes. SAS, SPSS and EXCEL are used to forecast the future farmland overall changes in Xi'ning city and to study its impact on future urban development moderation, offering a theoretical basis for Xi'ning to balance the relation between farmland protection and urban development amid the future natural resource planning.