Abstract: The purpose of this paper was to study thoughts and methods of constructing the indices system and determining its value and weights in farmland gradation by using Jiancaoping district as a typical combined area of town and county based on the standard of farmland gradation of China(TDT1005-2003). Methods of expert consulting and AHP were employed. Then the paper had classified the farmland at Jiancaoping district by applying the constructed indices system. Method of indices comprehensive appraisement model was adopted. The results indicate that the farmland of 2877.89 hm2 is divided into 7 ranks at Jiancaoping district of Taiyuan city, and its types of gradation are rather complicated but conform to normal distribution. Urban development has influence on farmland, which is an important factor that causes farmand gradation change. Furthermore, considering fully influences of urban development on farmland gradation, the system is comprised of 13 indices that is divided into 3 types including natural resources, social economy and ecological environment. At last, indices of socio-economy and ecological environment will cause to deviate from its classification. However, this will reflect the quality of farmland at a rather objective and accurate way.