In order to explore the effects of farmland quality evaluation on site selection of land consolidation projects, the methods of agricultural land use classification were used. Taking several project areas in Yanjin County of Henan Province as examples, the farmland quality before and after land consolidation projects was evaluated. The results indicate that under the conditions of reasonable site selection, the implementation of land consolidation projects can effectively improve the farmland quality and increase the grain productivity. Therefore, before the site selection for land consolidation projects, it is recommended to carry out pre-evaluation of farmland quality, and guide the project implementation according to the evaluation results. Besides, it is recommended to focus on medium and low level farmland with large centralized area, excellent original production conditions, but low level of development and use.