Abstract: After years of exploitation in Zhangjiagou Pyrite，groups of underground goaf were formed，which have brought great security risk to the lower ore miningOn the basis of comprehensively analyzing the current goaf situation and geological overview of Zhangjiagou Pyrite，three stoping plans were proposed，and the stability of goaf on +120 m level was calculated by using FLAC^3D .The variation of stress field of pillar and surrounding rock under different stoping schemes was studiedThrough contrasting and analyzing，stope sequence was determinedAnd on this basis，the goaf treatment scheme was proposed，which could form a sufficient thickness loose cushion in 113 stope bottom pillar by caving roofThe results can provide scientific basis for the construction and design.

Key words: Goaf, Numerical simulation, Stability analysis, Mining sequence, FLAC^3D