We analyzed the water phase and section pollution type by using single factor index method;besides,we studied the water phase and the relative degree of section pollution by using the methods of comprehensive pollution index and pollution load ratio. According to single factor evaluation on 24 chemical indexes in each section during 2005-2009,we found that the water quality in sections of upstream Fuhe Bridge and Xincheng Bridge was good,and the 5-year average of each evaluation factor did not exceed ClassⅡstandard for ground water,belonging to classⅡwater quality.The water in sections of Huangshui Bridge,Baolan Bridge and Shichuan Bridge was lightly polluted,and the 5-year average of each evaluation factor did not exceed ClassⅢstandard for ground water,belonging to classⅢwater quality.The poUution load ratios in sections were in the order of Baolan Bridge 23.38%>Shichuan Bridge 21.85%>Huangshui Bridge 21.18%>Xincheng Bridge 18.35%>Fuhe Bridge 15.18%.