After the operation of the Three Gorges Project, the Jingjiang reach underwent remarkable channel degradation, and bank retreat occurred frequently in local sub-reaches, which affected the transport of suspended sediment and the adjustments of channel geometry. The measured fluvial topographic maps and cross-sectional profiles during the period of 2002-2018 were adopted to determine the main zones and volumes of bank erosion, and the effect of bank retreat was then analyzed quantitatively on the channel adjustments of the Jingjiang reach. Calculated results show that:the cumulative volume of bank erosion in the Jingjiang reach was about 2.0×10⁸ m³ during the period of 2002-2018, which accounted for 17.5% of the cumulative channel scour volume (11.4×10⁸ m³). Empirical relationships were developed between cumulative bank erosion volume and fluvial erosion intensity during flood seasons in the Lalinzhou and Beimenkou sub-reaches, with the determination coefficients of 0.95 and 0.97 respectively. In addition, the total sediment amount from bank erosion in the Jingjiang reach was around 2.7×10⁸ t, and the total amount in the reach between Zhicheng and Jianli was 1.67×10⁸ t, accounting for about 30.7% of the total amount of sediment supplied from the channel. Therefore, bank retreat played an important role in the suspended sediment transport, especially for the recovery of fine sand along the channel. Finally, cross-sectional profiles tended to be wide and shallow during the stage of continuous bank retreat, while they became narrow and deep after the construction of bank revetment engineering. Therefore, bank retreat can reduce the undercutting of the riverbed to a certain extent in the Jingjiang reach.