Abstract: The farmland gradation has two objectives. One is used for the transition of farmland-use right among farmers and keeping the farmland for agricultural use constancy. The other objective is used for land expropriation compensation to the landowner; during this case, farmland is converted to construction land. It is different that the grading criteria of farmland gradation and the results of farmland gradation because the difference of farmland grading objective. Taking Wuqing district of Tianjin Municipal as a case study for farmland gradation. The indicators of farmland gradation were selected, the weights of these indicators were given according to the above two objectives and calculated the results. The result indicated that the farmland gradation were significantly different due to the farmland grading objective. So, it is necessary to make clear objective, give the principles of indicator selection and the guidelines for establishing farmland grading criteria.