Abstract:JiaoJia gold mining is using the upward layered approach filling method for mining,at present, the concentration of tailings filled with slurry is 68%,its use of tailings is not enoughand early strength is also low.Increasing the concentration is a good way to increase the utilization of tailings.The improvement of the concentration is inevitably deteriorated in the flowability of the filler slurry,therefore, adding the water reducing agent to the filling slurry improves the flow characteristics of the high concentration slurry.It has been found after the addition of naphthalene water reducing agent,significantly improved the fluidity of the filling slurry,and the bleeding rate has increased but the increase is small,the condensation time is correspondingly shortened.In addition with the addition of water reducing agent,slightly increased the strength of the tailings filling body,with the growth of age,the effect of water reducing agent on the increase of strength is more obvious,compared with the non-water-reducing agent, the tailings are filled with tailings,3d strength increased by 10.8%,28d strength increased by 29.6%.