The influence of land use on water quality was studied in both buffer zones and watershed. Total nitrogen, total phosphorus and chemical oxygen demand were selected to represent water quality. Alos images and DEM was used to gain the land use map and watershed boundary. Redundancy analysis was used to analyze the relationship of land use to water quality. The results indicated that the land use of 100 m buffer zone had a major influence on total nitrogen sampled in autumn and chemical oxygen demand sampled in both summer and autumn; that of 200 buffer zone had a great linkage with total nitrogen sampled in summer; and that of sub-watershed had a principal relationship with total phosphorus sampled in both summer and autumn.