Abstract: To better understand the hydrological features of Poyang Lake and provide reference for the construction of water conservancy facilities, on the basis of the measured water level at Xingzi Hydrological Station from 1935 to 2008, the basic characteristics of water level at the station and its variation trend are analyzed. The results showed that the variation features of water level of Poyang Lake can be expressed using the data of Xingzi Hydrological Station; The variation law in long temporal size is stable over 62 years; the high water level period is from June to September, the low water level period is from December to March, and the normal water level period is April, May, October and November. The evolution trend of water level of Poyang Lake is that the duration of "lake-like in high water level period" shortens and the duration of "river-like in low water level period" is prolonged.