In view of the current problems of surface subsidence control and solid waste disposal in mines, a fully mechanized gangue-throwing filling technology of "throwing instead of tamping" was proposed. Based on the principle of gangue-throwing filling technology, the mathematical model of gangue-throwing movement is constructed, and the basic parameters of gangue filling are obtained.On this basis, a simulation platform for gangue-throwing backfilling was built to carry out on-site sand throwing experiments, and the feasibility of fully mechanized mining gangue-throwing filling technology and the rationality of parameters were studied and analyzed.The results show that: (1) The actual measured values and variation rules of each parameter in the process of throwing gangue are close to the theoretical values, and the field design can be guided by theory. (2) When the throwing angle is 50° and the throwing speed is greater than 8m / s, it can meet the filling demand. (3) The overall filling rate of gangue filling can reach more than 95 %, and the accumulation angle of gangue is obviously higher than that of natural accumulation, and the filling effect is good.