Abstract: In order to deeply study of roof collapse character of large mining height working face under large incline angle coal seam, and every stratum loading of roof of 25213 working face with large mining height and large incline angle，and then theory analysis，simulation experiment and FLAC^3D numerical simulation were applied，and roof collapse law of 25213 working face was studied，the initially collapse space of immediate roof of 25213 working face was 24m，the initially collapse space of main roof was 57m，periodic collapse span was about 24m，it references for safety mining and mine pressure control of working face.