Abstract: The characteristics and tendency of channel evolution in the reach from Xiongjiazhou to Chenglingji in lower Jingjiang River is systematically analyzed on the basis of  water-sediment and terrain data before and after the operation of the Three Gorges Reservoir (TGR). The results reveal the river regime adjustments as follows: collapse has occurred at the upstream side of Baxing sandbar and Qixing sandbar as well as the river bankline at the unprotected section of the left bank of Guanyin sandbar; evident changes including chute cutoff has been found in the mainstream line of Qigongling bend, and natural cut-off of river channel is likely to happen during big floods. In view of the above analysis, considerations of comprehensively harnessing the channel by stages is proposed to provide scientific basis for the river reach regulation.

Key words: river reach from Xiongjiazhou to Chenglingji, channel evolution, river regime control works, TGR