The water environment condition of Weihe River reach in Shaanxi Province was analysed in terms of integrated water quality and quantity,based on the data collected over the period from 2000 to 2008.Moreover,the correlation between runoff and COD,NH3-N were major discussed at the main hydrological stations in Weihe River reach.The results show that the middle and lower stream of Weihe River reach in Shaanxi Province has already been polluted.The concentrations of COD,NH3-N BOD5 and DO exceed the national sur...