To ensure the drinking water safety and the sustainable utilization of water resources for the people living along the Anning river of Xichang city,and to know the water pollution degree and its development trend of the Anning River Xichang segment,the united standard monitor was carried out to the Anning river Xichang segment in the year of 2009. The monitoring includes 8 projects-BOD5,COD,pH,NH3-N,colority,turbidity,suspended solid,total hardness. The experimental data proved the water quality of the Anning river Xichang segment has been worsened from the third class to the poor five class. Overall,the water of the segment is badly polluted and tends to get worsen. To ensure the water environment quality of the whole basin,the following comprehensive measures are put forward：Treatment in accordance with local and seasonal conditions,Healthy development,Comprehensive utilization,Resources sharing.