Based on monitoring data of typical cross sections of Poyang Lake Basin in 2010 and 2020,combined with previous research results,this paper analyzes the change characteristics and trend of scouring and deposit of Poyang Lake,and discusses the causes.The results are as follows：1）From 2010 to 2020,Poyang Lake is in a state of scouring,with Tangyin as the boundary,showing a trend of scouring in the north and silting in the south.2）The scouring degree of the channel into the river gradually weakens,and the silting degree of the beach in the south and tail area of the lake basin intensifies,which is conducive to the development of the Delta.3）Human activities,such as water conservancy projects and soil and water conservation,significantly affecting the topography of the lake basin by changing the sediment content and hydrological situation.4）If the influence of human activities is not considered,the internal variation of flood sized and the spatial variation of flow velocity are the main factors affecting the spatiotemporal variation of Lake Basin morphology.