Abstract: Hunan Shanxing Antimony Industry Co.，Ltd.is planning to recover the shallow ore residues，and make backfilling with high concentration of paste-like filling system.The physical and mechanical properties of tailings backfill body selected from Tin Mine are tested in the laboratory，and its compressive strength and bleeding rate at different proportions and different concentrations are measured.A suitable filling material ratio for mines is determined to be 1∶2∶8 (cement：fly ash：classified tailings)，and its mass concentration is from 70% to 76%.Through computing transporting parameters of pipelines，a pipe with outside diameter of 0.114 m，and wall thickness of 0.007 m is selected.A series of parameters are concluded as the critical flow of paste-like slurry 0.97 m/s，hydraulic gradient of 885.92 Pa/m，maximum pipeline transport resistance 1.53 MPa，starting pressure of industrial pumps 2 MPa，and minimum pressure of the pump 3.53 MPa.Then，a suitable paste-like filling system for Tin Mine is built，which provides a guarantee for mine backfill.

Key words: Paste-like, Filling system, Pipeline network parameters, Hydraulic gradient