Abstract: This paper reports a study on the responses of waterway regulation projects to the Three Gorges reservoir impounding and the effects of a typical regulated navigation-obstructing section of the Jingjiang River during the impounding. Measured data of the river flow, sediment transport and topography were adopted in this study to analyze the trends of riverbed scour and deposition and the changes in waterway conditions in the regulated Yaojiang bend section after the impounding. We used a two-dimensional flow and sediment transport mathematical model to simulate this bend section and the actual effects of its guard projects and adjustable projects at an impounding stage of the reservoir following flood season. The results show that under the scour of river flow carrying little sediment at the impounding stage, the guard projects can significantly improve the waterways if certain conditions are met ? shallow waterways are in a good evolution stage and the regulation targets don’t differ much from their existing conditions. And adjustable regulation projects are needed to satisfactorily improve the conditions of those sections that are sensitive to the Three Gorges impounding stage following flood season.