Abstract: In order to research on the feasibility of backfilling the mined-out area with Matou tailings and Potland cement,basic physical parameters of Matou tailings were measured and chemical composition was analyzed and filling samples of different blending ratios were prepared.Test the uniaxial compressive strength of the filling samples of curing ages 7d,14 dand 28d,and analyze the changing trend of uniaxial compressive strength with the three factors of the concentration of slurry,aggregate-cement ratio and curing age.The results of this experiment were that through changing the grain size distribution of Matou tailings,the aggregates can be used to backfill the mined-out area and recommend paste filling.