Abstract: Compaction tests of different samples gangue filling materials have been performed to obtain the stress-strain curve and the best matching program.Development height of water flowing fractured zone in mining with gangue backfilling in one test mine has been calculated.Development height of overburden fracture can be effectively reduced by imposing an initial pressure on gangue backfill,which can greatly improve the compression performance.The development heights of water flowing fracture zones with different backfilling materials were numerical simulated.The results indicate that the development height of water flowing fracture zone can be reduced effectively by optimizing the ratio of filling material,imposing a lager initial pressure and increasing the backfilling ratio of goaf.