Based on analysing all kinds of sediment silting basins and their suitable conditions, the traditional sedimentation basin has been improved in three aspects， i.e.， setting an adjusting flow board in the fore of setting basin, adding a spillway trough along the flow direction, and redesigning the flush gallery by adding auxiliary flushing facilities. Thus a new - type continuously scouring basin was proposed. The results of model experiment proved that the new - type setting basin can greatly improve the deposition efficiency of suspended sediment and help the excluding of silt.