Dump landslides and mud-rock flow is a common geologic hazard.Investigation indicated that serious deformation and damage has occurred in the dump of Yichang Limestone Mine under the load of abandoned waste rock and soil,mud-rock flow disaster will be possible to happen in the rainy season,so a horizontal grilled dam was set up in the downstream valley to prevent mud-rock flow.Some parameters such as the amount of sediment deposition caused by mud-rock flow were calculated,on this basis,the type selection of dam body,the determination of dam height and the optimization of dam foundation were made,combined with the conditions for environmental engineering geology,a more reasonable plan to control landslide-induced dump mud-rock flow was designed.More satisfactory result has been achieved by on-site implementation of the plan,which can effectively prevent the occurrence of mud-rock flow disaster.