Abstract: Based on Mingxin coal company No.2 shaft roof caving mining steep seams on the impact of working face,research on theoretical analysis,physical analogue experiment and numerical simulation for the law of overlying strata movement in horizontal section of steeply inclined coal seam.Result showed that under the condition of horizontal section caving mining,with the advance of the work,the potential energy of the roof is greatly enlarged,the ultimate cause of the fully mechanized caving face roof falling,extremely easy to produce the impact of the working surface pressure and shock wave.In the initial stage of production,using artificial blasting caving measures can reduce the roof hanging area, roof caving backward cover floating waste form the protection cushion block production of good effect,reduces the risk of falling, to improve the safety of the working face.