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The water quality of a reach of Bailongjiang River, Jialingjiang river basin in Wuwei of Gansu province were evaluated mainly on the basis of fifty four samples collected from three locations. The purposes of the study were to assess the levels of parameters associated with the demands of the functions of the water body and to compare them with Environmental Quality Standards for Surface Water. Water quality parameters included pH, Temperature, Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), permanganate index, Total Nitrogen (TN), Total Phosphorus (TP), and NH 3Keywords-water quality assessment; Bailongjiang river; river reach -N were analyzed. Most of the water quality parameters met the Class II level of Environmental Quality Standards for Surface Water. As can be seen from the indexes, the water quality of the river reach can well satisfy the functions of the water body. It is recommended that priority in future projects more attention should be given to the non-linear relationships among parameters that are characteristic of ecosystems. Spatial and temporal distribution of the parameters should be given more attention.

KEYWORD: Dou River Basin; water chemistry; riverbank; human activity ABSTRACT: It is important to study the temporal and spatial distribution of water chemistry for the regional water resources management. In this study, in order to obtain the water chemistry distribution of Dou River Basin, collection and test works have been done for surface water and groundwater, and the results show that, the surface water showed less influence of evaporation effect, but the effect of the sewage makes part of surface water classed from the HCO3 type to SO4 type water, the groundwater far from the riverbank, Ca2+ and HCO3-, NO3-are the main contributors for the TDS increasing in groundwater, which means that, the groundwater far from riverbank affected by the human activities, and the groundwater near riverbank affected the dissolution of limestone and gypsum after the infiltration, and the evaporation and human activities also make important controlling effects on groundwater chemistry.