Abstract: Physical and chemical properties and mobility of tailings and solid plastic powder were researched by interior materials composition analysis, particle size screening and sedimentation test to study the basic physical and mechanical properties or the optimal ratio combinations of paste filling material with tailing as aggregate, plastic solid powder as fine aggregate. The paste strength of tailing with different concentrations and different ratios of silt were comparative analyzed by design orthogonal experiments. The results showed that the main chemical composition of tailings and solid plastic powder were similar, but the contents were different. The tailings diameters were mostly concentrated between 0.1 mm and 1 mm, which meets the requirements of filling. The settlement amount is reduced and the settling time is also shortened with the mass concentration increased. The slurry settlement value of the mass concentration of 73% decreased 3.5 mm and the settling rate fell 14.14% in first 10 min after adding binder. The positive correlation is between filling body and age when the mortar concentration is certain. The strength increased with the increased of silt ratio. The positive correlation is between filling body strength and age when the silt ratio is certain. The strength increased with the increased of mortar concentration. The silt is 1:5 and the mass concentration is 70% is the optimal ratio, which meets the strength requirements.