The sediment is dramatically reduced after the impoundment of the Three Gorges Reservoir.Experiments on the sediment deposition effect by the soft waterweeds structures are carried out in the low flow velocity region of the beach protection area of the Jingjiang Yaojian reach in the middle of the Yangtze River.This paper introduces the design idea,components design,sediment deposition mechanism and construction procedure of the waterweeds pats.The effect of the project is also analyzed.This new structure enriches the sand deposition structures.