Lake level data is an essential indicator for calculating lake water balance,and is also a significant parameter for lake break simulation research.Obtaining the data of the main lake water level and its changing process in the Hoh Xil area are of great significance to the assessment of water resources and flood disaster monitoring in the local and even the whole country.Literature investigation,lake vector data and ICESat/GLAS satellite altimetry data from 2003 to 2009 were used to extract lake level data of major lakes in the Hoh Xil region from1993 to 2009 combining with the meteorological and other data were also integrated to analyze causes of lake level variation.The results showed that(1)On the whole,from 1993 to 2009,the lake level in the Hoh Xil region presented a rising tendency,and less numbers of lakes declined the water level,however it also showed certain regional difference.CoNyi Lake expanded by 24.68 m,and Yinbo Lake dropped 6.16 m in water level;water level of 7 lakes fluctuated in the range of 10 ~ 15 m,which should been seriously noticed.(2)The dynamic change of lake water level in the Hoh Xil area was mainly related to climate change.Increased(or reduced)precipitation and reduced(or increased)evaporation of the lake were the decisive factors that caused to rise(or descend)of lake water level.And the secondary factors were the increase in frozen soil due to climate warming,melt water from glaciers and groundwater recharge form in the region.The using of satellite remote sensing technology for extracting lake water level information in large-area uninhabited areas has obvious advantages,but which has bottleneck of shorter time series of data is its bottleneck.Large number of lakes distribute in the Hoh Xil area,so lake water resources surveys and water safety assessments should be taken seriously.