Abstract: The influence factors analysis of backfill stability is complicated. This study focus on the dip of ore-body, geometrical morphology and mining method. The numerical simulation results showed:the dip of ore-body not only influence the maximum value of backfill footwall displacement, but influence its location. The relation of maximum displacement and the ore-body dip is linear. The geometrical morphology of ore-body has lager influence in the displacement distribution of backfill footwall. The mining operation in two sublevels at the same time could ease the stress concentration in mining void and make for the upper backfill stability. But this operation make the bottom backfill stress concentration more seriously.