The lake area and area change rate in nearly10 years were analyzed by using the multi-temporal LandSat TM/ETM+images,combining rainfall and evaporation data of four rainfall stations near Lake basin. The results were shown that from 2003 to 2013,the area of Dali Lake reduced from 204.11 km2 to 180.02 km2. The Dali Lake area decrease 24.09 km2. The average annual reduction was 2.41 km2. Over the past decade,Dali basin rainfall has a large fluctuations,but not significantly decreasing trend,evaporation of Dali basin is relatively stable and far outweigh the local rainfall. Rainfall is not a decisive factor in the lake area changes ,changes in evaporation of the lake area was less affected. In addition to accepting precipitation recharge,Dali Lake also accept groundwater recharge and groundwater may not be from the local precipitation.%以近十年的多时相LandSat TM/ETM+影像为数据源，从面积、变化率等方面对湖泊的变化过程进行研究，并结合达里湖流域临近四个雨量站的降雨量、蒸发量数据进行分析.结果表明，达里湖从2003—2013年湖面面积不断减小，面积由204.11 km2减小到180.02 km2，面积减少了24.09 km2，平均每年减少2.41 km2；近十年来，达里湖流域降雨量波动较大，但是没有明显减少趋势，流域蒸发量波动较小且远大于当地降雨量.分析达里湖流域湖泊面积变化与降雨量和蒸发量的关系显示，降雨量并非湖泊面积变化的决定性因素，蒸发量对湖泊面积变化影响较小.达里湖除接受降水补给外，还接受地下水的补给，且地下水可能并非来自当地降水.
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