With the farmland data of Yiyang area in Hunan Province during 2000-2006 as base and platform, based on gray forecast model GM (1,1) ,the dynamic changes of farmland in the,amount are explored to offer some reference for sustainable use planning of land. the results showed that model GM (1,1) fits a higher degree to the historical trends of farmland resources in Yiyang area, the forecast results also meet the amount changes of farmland. In the next few years, the area of farmland in Yiyang area will continue a decreasing trend. Therefore, p...