The indicators of the water PH value and conductivity (EC), total dissolved solids (TDS), dissolved oxygen (DO), ammonia nitrogen, chemical oxygen demand (COD), total nitrogen (TN), total phosphorus (TP), chlorophyll a (Chla), transparency (SD) were measured, using comprehensive nutrition, the number of eutrophication of the city water of Tongcheng Longmian River were studied. The results show that the water for the class III water, eutrophication index in 37.2 ~ 50.8, did not reach the eutrophic level, part of the region reached a mild eutrophic level. The main pollutants are TN and chlorophyll a and SD