Affected by the impoundment of Xiajiang Hydro-junction Project，the upper reaches of Ji’an hydrological station were seriously affected by the top-pounding and the hydrological laws were disrupted.The hydrological data of Ji’an hydrological stations(2010-2016)and Xiajiang Hydro-junction Project(2015-2016)were collected.The impact of the initial impoundment of the Xiajiang Hydro-junction Project on the water level of the Ji’an Hydrological Station was analyzed.At the lower water level，Ji’an station traffic is small，the water level of Ji’an station was jacked by the more obvious conclusion was drown.