Based on difficult recovery mining, low security coefficient causing the impossible mining of angle coal seam, combined with the actual situation of working face, cableway transport installation trackless by land was adopted in Wutongzhuang Mine to improve safety factor of steel wire rope, undercarriage was set in roadway upper cut eye, reducing the safe uncontrollability of undercarriage under cut eye, long wall mining was adopted, one time mining and all collapsed technology were used in goaf, reasonable setting and support were adopted to achieve large angle working face recovering mining, providing technical support and experience for similar working face.