Abstract: In order to explore the reliability of pipeline gravity conveying of full tailings-filled slurry in a mine，the slump，consistency，stratification，yield stress and plastic viscosity of each ratio of full-tail⁃ ings-filled slurry were tested. The critical flow rate and filling ratio of the recommended ratio of full tailings slurry under the current filling system conditions are calculated. The results show that when the mass con⁃ centration of the slurry is 70%~74%，it exhibits better flow properties. The actual working flow rate of the full tailings filling slurry with a lime-sand ratio of 1:4 and a mass concentration of 74% is more than the critical flow rate，and the filling multiplier in most stopes is less than 4.74. Based on comprehensive judg⁃ ment，the whole mine tailings can be used as filling slurry aggregate.

Key words: backfill mining, full tailings slurry, critical flow rate, filling multiplier