The research is conducted in the substrate amendment of coal-gangue pile in Jixi Coal Mine with the soil from tailrace dredging in the local rivers and coal ash from the generation plant as the soil amendment.After the amendment,the average pH value of substrate has deduced to 6.90 compared with the control pH value of 8.26;the saturated water content increases by 59.84%;water holding span has prolonged by eleven and a half days;available nitrogen content reaches 316.05 mg/kg,4.38 times higher than that of the control;available phosphorus content reaches 24.224 mg/kg,43.53 times higher than that of the control,which greatly motivate the growth of height,ground diameter growth and crown diameter growth of Ulmus pumila L.,Amorpha fruticosa L.,and Medicago sativa L.Statistics and experimental result show that mixed application of tailrace dredging and coal ash from the generation plant has significant amending effects on the substrate.It is an effective access to conducting the substrate amendment to coal-gangue piles and also one of the best ways to reutilize the solid waste disposal rationally.