Abstract: According to the selection of filling cementitious materials and the design of filling material ratio parameters of a gold mine in Anhui Province，the strength comparison test of the new cementitious ma⁃ terial cemented filling body and the cement cemented filling body is carried out. The results show that under the conditions of cement-sand ratio of 1∶8，concentration of 65% and 28 d curing age，the compressive strength of the new cementitious material cemented test block is 3.3 times that of the cement cemented test block. Through the numerical simulation method，the actual strength requirement of the filling body of the bottom structure of the typical one-step stope is calculated to be 3.5 MPa and the thickness is 14 m. On this basis，the recommended filling concentration is not less than 65%，and the ratio of new cementitious materi⁃ al to tailings is 1∶8 for industrial filling test. The field sampling of field filling shows that the average com⁃ pressive strength of the new cementitious material filling body sample is 4.42 MPa，which meets the require⁃ ments of the mine for filling strength and filling quality，and reduces the amount of cementitious material by 41.8%，thus saving the filling cost.

Key words: cemented filling of tailings, new cementing material, numerical simulation, industrial test, filling cost