Abstract: A horizontal pillar with 15 m of thickness was kept between -385 and -400 m to ensure the stoping safety of high or medium section during production period in Anqing copper mine.With the mining deepening，more and more pillars are reserved.It's going to excavate these horizontal pillars in order to recover copper mine as much as possible.Three mining plans including upward medium length hole stopping with subsequent back-fill，downward medium length hole stopping with subsequent back-fill，and upward drift stopping method are proposed for the horizontal pillar mining according to the real working situation.These three plans are contrasted from its efficiency and safety，especially safety.The upward medium length hole stopping with subsequent back-fill is recommended because of its safety.Four kinds of excavation orders are given for this plan，showing as from the middle to the side，from the left to the right，from the right to the left and from the side to the middle.Then，mine numerical model is created based on FLAC3D and Surpac software to calculate the four excavation processes at -385 m.The analysis shows that the vertical displacement，principle stress and plastic distribution are minimum by adopting the excavation order from the side to the middle.So it is the optimal scheme.

Key words: Horizontal pillar, Stopping scheme, Numerical simulation