Abstract: The land consolidation project, a key way to achieve sustainable use of land resources, can resolve the conflicts between people and land, and protect the cultivated land. However, land consolidation will have an important impact on the ecological environment. Eleven indicators concerning water, soil, biological and social environment are selected to build the matter-element model based on the analytic hierarchy process. On this basis, this paper evaluates the effect of the land consolidation project in S Town on ecological environment. The results show that S town's ecological environment was evaluated as "bad" before the land consolidation project but "good" after that. In the process of land consolidation, soil quality, soil fertility index, land reclamation rate, vegetation coverage and per capita cultivated land are all improving, thus generating good comprehensive benefits. In order to further improve the land consolidation and reduce negative influence on ecological environment,we advise that in future land consolidation projects,we must utilize water resources more effectively, raise vegetation coverage and protect the biodiversity, and establish the mechanism of ecological protection and management in land consolidation.

Key words: land consolidation, matter-element model, analytic hierarchy process, effect on ecological environment, Nanchong City