Abstract: In order to enrich the relationship research between resource environment and economic development, discuss the coupling of agricultural land and economy, this paper depended on the basic rules and methods of farmland grade, these data from 23516 monitoring spots were collected based on Huazhou City, and the farmland nature grade, use grade and economic grade were calculated. The areas of towns were used to cluster the data of farmland nature grade, use grade and economic grade. The methods of spatial autocorrelation and Moran scatter diagram were used to study the relationships among farmland grades. The research showed that: the farmland nature grades were disorganized in space, but these farmlands which had preferable use and economic grades were distributed mainly over paddy field. And the results showed that the use grade was in good agreement with economic grade, the couplings between the two grades were closer.