Along with the development of industry and agriculture, the changes in chemical characteristics of precipitation have been become a focus, pH value and conductivity of precipitation from 2007 to 2010 were analyzed to study the dynamic of these indices. The difference between precipitation forms, different heating seasons and monitoring sites were determined. The re- sults showed that fluctuated trends in pH value were observed in different years and months. Minor changes were found between snow and rain, heating seasons and different monitoring sites. Conductivity was sensitive to changes in environment, increasing yearly from 2007 to 2010. The differences of conductivity among months were great, with obvious seasonal change in 2007. Signif- icant differences were found between different precipitation forms, heating seasons and monitoring sites. In general, conductivity in snow and precipitation of heating seasons were higher than those in rain and non - heating seasons. Monitoring times and sites should be increased to understand the chemical characteristics more exactly and accurately.%随着工农业的发展，降水化学特征的变化日益成为人们关注的焦点。通过对乌鲁木齐市2007年-2010年降水酸碱度和电导率的分析，探讨其动态变化特征，并分析不同降水形态、不同供暖季节和不同监测点差异性。结果表明：各年和月之间pH值具有波动变化特征，降雪和降雨两种降水形态、供暖季节以及各监测点对pH值影响较小。电导率对环境变化较为敏感，2007年-2010年电导率均值呈递增趋势。各月份之间电导率差异较大，2007年具有一定季节变化，2008年-2010年季节变化不明显。不同降水形态、供暖季节和各监测点之间差异显著。多数情况下，降雪和供暖季电导率高于降雨和非供暖季。随着城市规模的扩大和经济的发展，为了更加准确了解城市的降水化学特征变化动态，需要增加监测点位。
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