Research on agricultural land classification method in Zhashui County

To explore the specific methods of implementing agricultural land classification and rating, this paper, taking Zhashui County for example, uses Delphi method, straight-line method, buffer method and the shortest path method to establish Rating Factor System. Factors are valued and quantified according to its different types. On this basis, calculate classification index, and make preliminary classification of agricultural land. Through differential income test, correlation test and experts´ demonstration determine the rating level. The result shows that this method can not only quickly classify farmland level but also inspect the rating accuracy to ensure the accuracy of the results.