Abstract: In order to release the problems of the abandoned drilling mud discharging and treatment, the paper had a study on the preparation of the surface pre-gr outing grout with the abandoned drilling mud.With the sticky reduction and modification treatment of the prepared mud, the density and sticky of the grout would be redu ced.The plasticity strength of the grout would be slowly increased and could be reached to 50 kPa after about 15 h.The grouting project with S boreholes for the mine m ain shaft of Yuandian No.2 Mine, Huaibei Coal Mining Group had consumed the drilling mud grout of 7 606 m3.After the mine shaft excavation and measurement, the re sidual water inrush quantity at the grouting section of the mine shaft was about 3 m3/h and the grouting effect was excellent.