Abstract: The developmental condition of F₇ major fault in Yuandian No.2 coal mine is introduced in this paper.The roadway deformation failure law between no fault rock and fault rock is analyzed contrastively by using large-scale three-dimensional geotechnical software FLAC^3D.The results show that the range of stress relief zone is bigger and displacement change is larger in fault fracture zone roadway;according to its deformation failure law,whole section "U"-steel support way is used to strengthen the roadway support.Monitoring results show that this support method can better control surrounding rock of roadway in fault fracture zone and maintain the stability of roadway.