With the implementation of the middle route of the South North Water Transfer Project,incoming water and sediment process in the downstream waterway of the Hanjiang river will change significantly.Low discharge will last longer,the rate and duration of middle discharge will reduce,and the amount of sediment will decrease.The existing method for determining the regulation stage cannot be applied to the new water and sediment conditions.A new method for calculating the regulation stage is promoted,and the results are applied to the waterway regulation works in Xinglong Yuekou reach in the downstream of the Hanjiang river.