Based on the field data on early stage of the Three Gorges Reservoir, we analyze the sedimentation deposition in the typical curved reach of Longwangtuo and Niushiqi, which shows that Longwangtuo reach emerges a cumulative deposition trend, and the cumulative deposition is about 0.678 million cubic meters; Niushiqi reach started deposition from 2007, and siltation mainly appears in the deep channel. It continued deposition in 2008, and about 0.208 million cubic meters sands were deposited to 2010. From a long-term point of view, deposition in the curved reach will be more serious with the rise of the water level, so it′s necessary to pay enough attention to navigation obstruction possibly occurring.