After the impoundment and operation of Xinglong hydraulic complex,the impact on the low water level and water level uplift relationship downstream of the dam is preliminarily manifested.We systematically analyze the changes of discharge and water level characteristics of hydrological stations and water level stations in the lower reaches of the Han River from 1970 to 2022.The results show that after the operation of the Xinglong hydraulic complex in the Han River,the downstream of the dam shows a cumulative decline trend of the low water level for the same discharge with a smaller decrease towards the downstream.When the water surface gradient of the Hanchuan to Hankou section and Xiantao to Hankou section is lower than 0.020‰ and 0.025‰ respectively,the water level uplift effect of the Yangtze River significantly affects the water levels of the Hanchuan and Xiantao hydrological station;when the water surface gradient is higher than 0.060‰ and 0.065‰ respectively,the water level uplift effect of the Yangtze River water level does not affect the water level at Hanchuan and Xiantao hydrological stations.Comparing with the period from 2003 to 2012,the number of days with a gradient higher than 0.060‰ and 0.065‰ in the Hanchuan to Hankou section and Xiantao to Hankou section during the period from 2013 to 2022 shows an increasing trend.The combination of the water regime of the Han River and the Yangtze River during the period from 2013 to 2022 is conducive to the stability and development of the water depth conditions in downstream channels of the Han River.