Abstract: The Yangtze Estuary deepwater channel regulation involves large scale treatment projects at the diversion of the North and South Passage as well as in the North Passage. Up until 2010, the first, second, and third construction phase have been completed, and the regulation purpose was achieved with the water depth of Yangtze Estuary amounting 8.5 m , 10.0 m , and 12.5 m respectively. However, since the maintenance of the 10 m depth water of the second phase, especially since the third  phase project was constructed in 2006, the maintenance dredging amount of the waterway (including the sedimentation during the third construction stage) has increased rapidly, and the distribution of the sedimentation along the waterway is very uneven. In order to increase the ebb velocity on the siltation concentrated sector, brush the beach face lower, and reduce the siltation finally, most of the groins were extended in 2009, yet with few effective results. In view of the above, summarizing the experience of this project and discussing the theory are necessary. This article examines the influences of regulating structure on the morphology of the North Passage and the conditions of the water, sediment and terrain, and analyzes the reasons of high sedimentation. Finally, this article sums up the theory and methods on the estuary regulation.

Key words: the Yangtze estuary deepwater channel  ,   median water river bed  , river regime control；regulation  , widening rate  ,   dredging