Abstract: Dredging in rivers and lakes can cause sediment suspending and make water turbid. In order to control the environmental pollution by dredging, attempts have been made to use bubble curtains to block the sediment, and on-site and indoor experiments have been conducted. Comparing the changes in sediment concentration at fixed measuring points with and without bubble curtains, the interception effect of bubble curtains on natural sediment and kaolin particles was explored. Based on this, the concept of turbidity interception rate by bubble curtains was proposed. The spatial and temporal variations of sediment concentration behind the bubble curtain were measured, and the influence of aeration rate per unit width on the turbidity interception rate of the bubble curtain was analyzed. The experimental results show that the bubble curtain has a certain turbidity interception effect, its turbidity interception rate being 0.8 for natural sediment and over 0.4 for kaolin particles. With the increase of the aeration rate per unit width, the turbidity interception rate of bubble curtains increases and then decreases. The bubble curtain has good applicability in controlling the diffusion of dredging sediment and, especially when used in combination with silt curtains, can further reduce the diffusion amount of suspended sediment while allowing free passage of ships in the dredging area.