Abstract: The data of evaporation from 20cm pans in the Urumqi-Changji region during the period of 1981-2010 were used to analyze the evaporation trend in the study area using climate trend method. The results revealed that, in recent 30 years, the evaporation was increased in midmountain and alpine zones, especially in alpine zone; it was in a decrease trend in plain and hill zones, especially in plain. Seasonally, the evaporation was increased in the Daxigou and Tianchi regions, especially in spring and summer; it was in a decrease trend in plain and hill zones, especially in summer, and then in spring, autumn and winter. Accumulative anomaly was used to test the sharp change of evaporation. The results showed that the evaporation in the Urumqi-Changji region was sharply increased in the alpine zone in the late 1990s, the sharp change of evaporation was not significant in midmountain and hill zones, and the evaporation was sharply decreased in most parts of plain in the late 1980s. The analyzed results of the coefficient of partial correlation revealed that the dominant factor affecting evaporation was the increase of temperature in the alpine and midmountain zones, the increase of relative humidity in the hill zone, and the decrease of wind speed in plain.  

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