Monitoring of river basin water reserves is important for studies of water resources variation and water balance.GRACE satellite provides a new measure for the research of variation of water storage.Spatiotemporal change of water reserves was analyzed by the GRACE satellite time-variable gravity field data and the precipitation data which from 30 meteorological stations during 2003 to 2012.Trend analysis method is employed to investigate the trend of water reserves in Dongting Lake Basin during the last ten years.The result shows that: In space,Variation of water storage decreased from northeast to southwest in the Dongting lake basin.In terms of time,there is an obvious seasonal variation of water storage and precipitaton,and a similar tendency existed in both,but the maximal value of water reserves lags behind precipitation about a month.Water reserves was holistically increased in the last ten years,which increased 0.5mm monthly.Water reserves increased at all seasons,but the maximal value is 26.07 mm·a ~(-1) in the autumn,incease of water reserves in the Dongting Lake Basin was mainly caused by global warming and rising rainfall.