Abstract:The shrinkage rate was an important indicator of filling engineering, which seriously restricted the roof contacting quality of backfill. The unclassified tailings of jinchanghe lead zinc mine in Baoshan were used as experimental materials, in this paper, the characteristics and rules of bleeding and shrinkage of tailings were studied, and the influence of slurry concentration and cement content on the shrinkage property were analyzed. The results show that: ①The shrinkage rate of cemented filling slurry was lower than that of non-cemented filling slurry. ②In the cemented filling slurry, the slurry shrinkage will gradually decrease with the increase of slurry concentration. ③In the range of 60%～68% of the cemented slurry concentration, the slurry shrinkage will gradually decrease with the increase of cement-sand ratio; when the slurry concentration reached 70%, the variation range of slurry shrinkage was very small, and there was almost no shrinkage.