Abstract: With several years of mining,a large quantity of cavities are formed in a gold mine in the south area,which damages the stress of primary rock balance of the rock mass and becomes the major source of danger influencing the safety of the mine and adopting tailings to fill in thecavities is the most efficient method to eliminate the potential source of danger.But the mine has no filling aggregates by itself.In order to select the applicable aggregates required for filling in the mine,we analyzed the basic physicochemical properties of the Huangshilao tailings and shuimuchong tailings respectively,and at the same time,we tested and analyzed the properties of sedimentation,permeability,slurry mobility and intensity of filling aggregates,etc.;according to the test results that,the properties of Shuimuchong tailings are better than the Huangshilao tailings.Finally,we decide to choose the Shuimuchong tailings to fill in the mine on consideration of the actual conditions of the mine;we confirm the optimal filling slurry mobility parameters as followings according to the filling ratio test result and on combination of the filling slurry mobility:72% of filling slurry concentration and 1∶8 to 1∶4 of cement-sand ratio.